If she had already raised the bullying with the school and they failed to deal with it then I would fight them tooth and nail. When my son was being bullied I told the school that at one point he would snap and hit back (and he's a big lad!) and that if he did, I wouldn't punish him and if the school did then I would take him out of school and for a nice trip to negate their punishment. I don't think that hitting is right, and I would hope that things got dealt with properly without the violence, 2 wrongs don't make a right. However, I would support my child in those circumstances...........and it may have fixed the problem.