I believe Mass has a little-known rule called emancipation....which typically means at around 15 or 16...you file paperwork with the local judge and demand your adult freedom....from all guardians (parents and otherwise). If I were the family, I’d just hustle in the forms to her, have them signed, and force the Boston judge to give her adult status, then walk out the door and catch a cab back to Conn.
I think most states have that. Florida does.
for emancipation the minor must prove income etc and being capable.