If it seems like nothing is going to improve, then figure out if it will be the same everywhere and your DD just needs some social skills training, or if it just that school and your dd's place in the hierarchy. I wouldn't keep her long-term in a situation where she's unhappy and there is little hope of improvement.
I have a call out to a psych. whom I interviewed awhile back. DD is NOT going to be happy about trying therapy again, but on the other hand, she isn't happy where she is. At any rate, I can run all this past the psych. and get her response.