I'm not trans, but I found high school unbearable. I thrived in college. I think it's much easier to find your people at university than among whatever kids you're stuck with in your local school.
Not sure how having had surgeries would make any difference, but there are LOTS of LGBTQ community opportunities and mental health supports in Boston/Cambridge and MA generally.
I am not predicting how Jazz will fare, but in general, I'd much rather be in MA as an adult than in FL with my parents, speaking as a cis lesbian. Maybe Jazz will crash and burn, but she might also thrive.