I've also heard of one called "letter of the week" which has some good ideas. I've based some of what I do with my son on themes there.
Each week is based around a letter and it recommends a list of vocab words, a science activity, a math activity, a song, poem/rhyme of the week and a few other things. Good book lists too, suggested around the letter theme. There's also a preparatory curriculum for younger kids to learn letters, colours, etc as well as a theme of the week, but that might be too easy for your girl.
I think that the site is
www.letteroftheweek.com. It does also have a Christian based element to each week suggested but you can take or leave as you please.