Your daughter sounds great! It sound like you are doing good job in encouraging your daughter in her interests and it will be an great asset for her to know what kind of practicing it takes to learn a new skill.
When you think about it, playing violin is not that much different to start practicing swimming, football or ice hockey at young age and most parents are fine with those hobbies.
Maybe they just haven't heard of such thing before to be able to fully evaluate what it means. After all after using 1 hour a day for violin lessons, you still have 23 hours left for free playing too! It is all about cultural norms and you need to do what is right for your family regardless of those norms. You must do (as you are doing!) what is right for your family because you are the only person able to evaluate that. Anyway, you are doing great supporting her interests and giving her possibilities to perform with other children. Karma to you!
We have also been planning to start some instrument after finishing second curriculum in Little Musician but this is so far ahead I haven't planned it that well yet.