Honestly, I would keep her with her age group right now. There will be plenty of time to move her up in the future.
My son was well above the rest of the class in Kindergarten, but I think it helped him to be in with his age group. He also got a pretty easy year to learn the rules and regs of "How to Act in School".
It's stressful enough just starting school... not to mention throwing her into a class with a bunch of older kids that are used to the routines and rules of school... Just my
