Poor little poppet. That's horrible.
She needs to know that she is supported and that she has done nothing wrong but I'm not sure that it will help her to move her away from the situation. I know how horrible it is when your children's friendships turn sour and they are suffering but unfortunately it's not going to be the last time that she has to negotiate with someone who is mean and spiteful and helping her in those negotiations might be of more value to her than removing her. It sounds like her teacher will be really supportive and the mean boy will be dealt with which I think is important. If you want space between them then I would ask the principal to ensure that this happens.