So sorry you're going through this - it's a hard decision to make but, like the other posts, I'm shocked and amazed that the school have been so careless with the kids' safety. On that issue alone I would consider moving them.
You mentioned last night on another thread that your DD1 is very similar to mine (v. sensitive - having trouble at night). My DD is lucky she has a good circle of friends but I don't think she would cope given the situation at school your DD has. Although girls can and do get on with boys, other girls as friends still take priority at this age.
All in all I have to agree with other posts - change school.