She has been in the hospital the whole time, right? Because otherwise, I agree, she should be placed with relatives. But it seems like there have been no placements because she's being held in the hospital on a psychiatric hold. That is highly abnormal and done when people present a danger to themselves. Normally a court could also just leave the parents with custody but issue a ruling on medical treatment - because this played out the way it did, I do not believe the main issue in the DCF case is which medical treatment to pursue. I believe that DCF believes her parents are worsening her compromised mental state and as a result can no longer direct her care.
You cannot merely rely on the parents' statements when it is clear the parents are difficult.
You can't rely on DCF/Children's because they can only say some carefully phrased things. You can probably rely the most on the judge, but he obviously only looks at certain things and can only release certain things. And the Tufts doctor is probably reasonably reliable.
Because I read cases a lot, including family law cases, I know how to read between the lines on these things, and it's just common knowledge that you don't spend that much time in a psychiatric ward unless you are a danger to yourself. I don't claim to know what is going on with everything here, and what condition she has, and all that. But it's clear to me that the legal reasoning and justifications going on here imply certain things that people don't seem to understand, and that the complexity of the medical issues is also confusing people. It's a complex case with a lot of things at play.
That is why I believe CT will not get involved. CT politely said it would help out MA while saying MA has jurisdiction, and that means they aren't interested. That was just a PR statement. That's saying "it's not our job." The judge wanted them to take over. MA didn't try to give her to her parents, but MA tried to give her to CT social services to manage the case, which by implication focuses on reunification. CT won't manage it. They agreed with MA apparently and would not give her to her parents right away, but probably feel like they don't have the facilities in the meantime. Boston has the best hospitals maybe in the world. No state wants to take someone out of a Boston hospital and take on such a tough case.