I am sorry for your daughter. Hope the situation improves.
I was bullied as a kid, and it leaves scars. I wore coke bottle glasses, had a funny last name, had a grandma instead of mom and was a bookworm, got good grades and was very nerdy. Might as well have had a target tattooed on my forehead! The ringleader of the bullying was a year older than me and had big brothers to help her do her dirty work, and I was scared of them. I could have been a track star because I ran all the way home from school so many times to avoid them. But one day she started trouble when her pack of friends or brothers weren't around, and I got so mad I forgot to be scared and thrashed her. Grandma actually stopped me, as I was pounding her head on the sidewalk... That was a turning point although my self esteem was still low. We moved not long after that, although not due to that. At the new school, I made it a point to be friends with a couple of girls who were bullied and made fun of. Kids can be so cruel and the parents need to try and make them understand how bad they are making those kids they bully feel.