Two things come to mind: 1) Your daughter needs to understand that, no, she does not have to get along with everyone or like everyone. In fact, she can flat out tell "mean" girls that they are not friend material. If you figure out where your daughter's need for approval is coming from, perhaps you can help her with this - perhaps she just needs your permission to not be nice all the time along with some modeling of how to do this effectively? 2) Contact the teacher and the guidance counselor asap - I would send and e-mail for documentation purposes, and be very descriptive about what your daughter is experiencing and who is involved, as well as your guess about whether there might be a specific girl taking the lead. Try to convey a mix of concern, openness to intervention, and seriousness - a friendly reminder of zero tolerance for bullying never hurts. Request that the girls problem solve with the counselor as a first step. The trick with bullies is to make it not worth their time to pursue, both via your daughter's reaction and by the consequences (i.e., meeting with counselor, having to talk about it, possibly getting in trouble). If your daughter continues to want to interact with these girls (i.e., need for approval), you might want to set her up with a therapist to help her figure out why this is! Good luck to you!