I'm so sorry you have to go through this @didntsignupforthis. My dd19 also hated school and begged us to move her to a different one. No one liked her. She didn't like anyone. Would do her homework and not turn in. It got to the point where a "D" would put a smile on my face. It was heartbreaking to watch so I kinda understand where you are coming from.
My ds is a teacher and she was my salvation. While she didn't work at dd's school she did know people there who checked out the situation to make sure dd wasn't being bullied. And, the teachers all said, she is a lovely kid but needs to grow up. So Tough Love it was.
You are doing the right thing. SWorkers see so much in their line of work and if they are telling you its the right thing....even though its tough as hell, it probably is.
Hang in there and I am with @bakingmommy - I wouldn't take her calls. It's hard enough to deal with as it is. Call back on YOUR time when you feel a little stronger.