Following. We are doing CLE as if is easier to implement for little ones. But I would love to hear how others are doing withe Saxon also.

Personally I do recommend using Australian coins. But I understand how using American coins is beneficial as it heavily relies on quarters. I am not sure if you are aware but you can get American coins at banks. My mum used NAB. But you can also get them exchanged at an airport. You will pay an exchange rate. But it might work for you. You might need to do several trips. I have priced some toy coins and have found that real money is almost always cheaper, but I am in the US.

I try and build solid associations when teaching colors. Green like the grass works here as our grass is always green. Leaves change so that wouldn't work. Sadly we can't do blue like the sky or white like clouds either. We use white like snow instead. Works great when we have snow.  But we do things like yellow like the dogs bed or red like the family member's car.

Oh do please keep sharing. So much of this is familar. It is what we did with my son when he was an infant. Pretty much all of this sans the languages. But we did it through play. I kept notes of what to do and just kept trying to make a habit of doing these things. Many things can be implemented each time the baby is nursed. Or after a not. Or as they get older after feeding time. It seems so overwhelming. But a groove can be found. Just do things incrementally.

Starfall was the best that I found for teaching letter sounds other than preschool prep videos.

There is such a fine line between typical quirk kids and atypically developing kids. And it is hard to tell the difference when a child is right in front of you. I highly recommend ay qualms you have be Addressed to a specialist. As she is 5 I would contact your local school district and see if they could direct you to the right place.
Fwiw, my son does a lot of these things and he isn't typical. He has a sensory disorder. But he is quasi manageable with a lot of assist. But I known kids that have been like this and they are completely typical and do not need any assists.

I think there are a few options.
Public school or private school as a babysitter. You could do teaching when they are out of school. This is an option if you have to work.  Many people then after school of car school their children to keep them ahead.
Some public and private schools have gifted classes, or pull out programs. Others allow grade skipping.
But frankly I think a lot of the time much of the good comes from the individual teachers. Some teachers are amazingly equipped to keep challenging a kid. Other balk at the idea and assign silly work.  You could also send work if you felt that the child needed challenge.
Another option is to hire a qualified person to homeschool your child. In many cases this would have to be a teacher and it may work out at about the price of private school.
Another  option is an ungraded school. These are tricky to find. Montessori can be considered one. But there are some private school and charter schools that are ungraded. The whole thing is to progress your child at whatever level of work they are on rather than relying on a grade.
And of course homeschooling is an option. But similar to homeschooling is public school at home. You have a curriculum provided to you and you have the support of virtual certified teachers. I have heard mixed things about acceleration this way. I heave heard that it can be done, I have heard that the school might be a stickler for not accelerating. Since I know more kids that were able to accelerate that not, I am wondering if the lack of acceleration may have just been parents thinking that their kids were further ahead in work than the teachers agreed with. But that is my theory.

I hope those give you a few options to consider. My son is 5 at the end of the year. He misses traditional kinder cut off.  But he could have started Kinder at out public school as an exception  this year, he was accepted at a public school at home virtual school, and we most likely could have out him Into an ungraded school. But we chose not to. In our state he does not legally have to enter school until he is 6. So I think we intend to keep homeschooling and decide at that point what we want to do. Honestly though, we are never ready for the decision.

Do you have her email? I find this an okay way to deal with people who are concerned about confrontation. Many years ago I was a live in nanny. And we communicated via notes a lot. It worked great. If there was anything to really discuss we could. But generally the notes took care of most things in an amiable way. 

General education was limited in rural QLD when I was in school a little over a decade ago. I remember having a long discussion about it with my English teacher in year 12. Apparently in NSW and VIC they have a lot of general education. I am glad that has changed. Also as far as prerequisites we only had to do English in year 11 and 12. Maths and sciences could be dropped after year 10. And there was no foreign credit after year 8 Japanese. In year 9 and 10 we did have to choose a social studies. Either geography, history or civics.
The trade thing was an option almost 20 years ago when my brother was in school. That is what he did. From what I have been reading it is not too common here in the US. My American husband went to a trade school and we have one in our small town also.
The university dual enrollment thing is new to me. I am glad that then are having that option.

Any chance the characters can be leant through books or other children? My son didn't watch TV but he knows many characters this way. I would just tell her your concerns. It is best to have open communication with your daycare provider. She might think you are okay with the current arrangement.

I Don't mean to be presumptuous but are you sure that 18 is the age. If I were willing to send my son to Kindergarten this year he would graduate college at 17 by not accelerating at all. This is not an exception as there are many kids with birthday between June anspd September or even so far as Decmeber that fall into this category. Without knowing the state you are in it would be hard to dispense advice. I would be willing to look into this for you. You can PM your state if you don't want to share it here.
I know in OH you can dual enroll in college at the age of 14-15. You can also graduate college if you have enough credits at a young age. I have had public schooled friends in CA, NV and ID all graduate at 16 as they did summer school, had the credits and passed their states high school test.
From what I know there is no age limit. It is really an academic limit. You can test for the OGT (Ohio graduate test) the spring of Sophomore year. The easiest way around this is to homeschool and show a students portfolio that is doing Sophomore level work. They could be 10 or 15. This is one loophole.
I may be wrong but I think one can take the GED as young as 16 also. But this is not really a college path option.

Mandab just in case you were unsure. College in the US is the university system in Australia. The big exception is that US college has a general education requirement that Austrlalian university does not have.
We do have universities here in the US. A college becomes a university when it is large enough and the have a certain number of post graduate degrees. In my town the former college only became a university once it had purchased a large enough chunk of land for it to be one. But people just usually refer to university and college as college.
We also have something called Jr College or Community College. These are not quite like TAFE, but almost. They offer mostly academic 2 year associates degrees. Nursing might be a an exception.  They are cheaper and an alternative way for sub par high school students to transfer into a full college or university.
We also have career  or vocational high schools. Which is where the trades are taught. This is also, but not completely like TAFE. TAFE is a mix of community college and vocational high school.

That is  not necessarily true. In many states they have to be a sophomore in high school or only around 15. With homeschool one could consider a child to be doing sophomore work much younger than 15. They still have to test out with a high school exit exam though.
Every state differs. I know many regular track public school students that graduated at 16 or 17.

And it is written by an Aussie, a Queenslander to boot!

I have used a method similar to this for years. I learn best by teaching. I learnt about this technique when I was in 5th grade. I was in a 5th-6th-7th composite class and one of the things my teachers had the older students do is to teach the younger students. I learnt short division from a 6th grader. It helped the older students master their work and it helped us younger students by getting som swift one on one. This was a special class and by the end of the year all the class members were at least a year ahead of grade level.

I used this same method with a girl I was tutoring. I had her teach James stuff when James was younger. Sadly James is about on par with her now. She is 12 and I don't want to crush her spirt by teaching almost level grade with a 4 year old.
I also have James teach the little one I watch. He is teaching him colors, shapes, math and reading via their play.