I don't think I have anything unique. However, a day at the luxurious spa would be a great gift. I usually am the practical gift giver to teachers and bus drivers though. I give gift cards because I know they will be used. Sorry I'm not much help.
I will say, unless you are some spectacular crafter, I would avoid homemade anything.
Honestly, don't try to get too creative. I like the spa idea, but some people aren't into that stuff and it may go unused. As a teacher, my favorite gifts are Target gift cards. Yes, it sounds boring, but i can get anything I want with it. I say put whatever amount of money you want to spend on a Target gift card, and write a really nice letter to her. Seriously, that would make my day.
Re: Xmas ideas for a super amazing teacher