My daughter is talking about suicide

My daughter has been bullied so intense by these girls at her school for no reason. I've been to the school, talked to the parents, went above their heads and nothing. It started off with rumors, and then being told to kill herself to the point the police got involved last week because these girls jumped her on her walk home. She got beat up pretty bad. The police were useless and just told the girls to stay away from each other. She was actually friends with one of the girls before but how that friendship ended was we found out my daughter was pregnant. I wasn't happy that my 16 year old was pregnant, but we were gonna get through it. She ended having a miscarriage and I let her stay home from school for a week. She told that girl and that girl told everyone she had gotten pregnant by a grown man, which wasn't true. Shes been dealing with this bullying for a while. I would never put my hands on a minor, but when my daughter is crying to me in her bedroom saying she doesn't want to be here anymore, I want to fuck everybody up!

Edit: The reason switching schools isn't really an option is because our town only has one school Highschool. For her to go to a different school she would have to go to one in a different town and we have no way to get her there.