Talk to the school counsellor yourself, find out what they are doing to help. Ask the principal for a copy of the school's anti- bullying policy (all NSW school must have one, not sure about other states) I have a book which I have lent to one of the mums from my school called "Bully proof your child" not sure who wrote it but maybe a book similar would be good to read. Chat to your daughter about strategies for making friends and how to be a good friend, invite someone over to play so you can observe how she acts with others, also this really helps children's friendships at school. Spend some time alone with her, difficult I know but she may be wanting your attention.
I will check some other resources that I have at school (I am a teacher) Are you in NSW?