M.D.
My daughter was having a problem in 5th grade when she was 10 and I was at a loss in how to help her. I emailed her teacher and simply wrote out what my daughter was telling me and asked the teacher to let me know what was going on. She kept an eye on my daughter and the other girl, saw how they were acting, and helped me to help my daughter. It comes on both sides - reaction can drive how people are treated. So I would not remove her, I would help her learn to deal with this. Also, encourage her to talk to the counselor - they are there to help these kinds of situations.
My daughter is now 11 and in 6th grade and she went to the counselor on Friday morning because of two "mean girls" - the conversation ended with the "mean girls" realizing that my daughter did not say what someone said she said and they can now be civil. But she was comfortable to do that on her own. I encourage you to teach your daughter how to work these issues out without you stepping in.