Personally, as long as the horse is 2 (in may) and not pushed, I see no issue with backing her. There are also some who back their 2 yr olds , put a gentle foundation on them, then turn them out another year. All I would like the OP to be able to do is know what the possibilities are as well as the issues. It is her informed decision to make. It is not an "all or nothing" deal. THe horse CAN be broken at 2, safely, as long as it is gentle, with a bit of common sense (which, I Know is NOT common). Obviously you wouldn't put a 300 lb man on her to lope circles and trot hills.