Absolutely agree with Nicki and also have a child who's been there and come out of the other side of it.
Be proud of her for not falling into the all too easy trap of being as mean as these other girls just to fit in. My daughter went through this at a similar age and is now nearly 11 and has a very nice group of friends...a small group but so much nicer than the little madams who tried to demoralise her.