Have you heard of EFT (emotional freedom technique)? You would be able to help your daughter to become unaffected by her peers, and to let go of the anger toward her teachers. In my experience of EFT over several years I’ve had wonderful results. It is easily self-taught from the website’s free manual, or you could track down a professional (it can be administered over the phone too). You can read all about EFT on the original founder’s site: http://www.eftuniverse.com . There is a link on children’s issues there too.
Best wishes for your daughter’s healing.