Tough call. My sister and niece are going through this exact thing. The difference (I think) is that my niece has switched schools every couple of years so has learned to run from problems. She always thinks going to a different school, there wont be the same kinds of catty girls etc. (though she can be one too, as we all can be at that age) She meets a kid or two she likes, then thinks their school is the best then switches and in a few months there is drama again. (and she is not much of a difficult child, she still has straight A's, joins the family for everything, etc...but she is getting into teen life every once in a while for sure...). MY sister thinks it would be a disaster to switch again, but she does not want the drama and fight from not allowing it either, so feels very stuck (and ex hubby is not a help at all)
For my youngest sister this happened too and to this day she will do the same with jobs. But my cousin's kid did it once to get away from a bully situation and it was the best thing ever. Same for one of the volunteers at Q's horse back riding place. She nearly killed herself over the anxiety and trauma at her school. She is now in a charter fine arts school now and their philosophy is diversity and inclusion. The whole culture of the school is acceptance of differences and celebrating differences. She is a leader now instead of wanting to kill herself. If it is the right move, can be amazing. I guess it depends on the reasons and if you talk to the staff about what she is going through. What if they dont tolerate her missing and wont support you? OR...maybe they have an on site EBD teacher and you can get a TON of support..... Just as always there will be great stories and reasons to do it and others that suggest not. What does your gut say? Have you had a chance to go on your own and talk to the admin and counselors there? Can you meet their school psychologist?
Good luck with that, you are such an excellent mom, I am sure in the end you will help her through either decision and she will do well. Giving her some control and her mindset being that it will help could be a big ticket, so who knows? Is it far???