My daughter says she does not know what it was. Now, the other girl has turned other children against my daughter. My daughter comes home upset about school every day. I would'nt talk to the teacher or parents yet. This is a common problem through middle school and into the first years of high school.
Children are best friends one week and worst enemies the next.
Even though it is common, your daughter is experiencing real hurt. This is never easy for a parent to see. You can offer her advice, but be careful. If she tries one of your ideas and it does not work, then it is your fault. It may help to pose your suggestions as ideas from your adolescence.