"Not everyone can be fixed"
People working outside of services who cater for people with duel or a complex diagnosis often can't take this on board.
I know Parents of Adult with a similar diagnosis and they are struggling to keep their children from morbid obesity. In one case luckily their daughter enjoys drama workshops, so it is a form of bribery, to get her to move. But Stephanie could be aggressive and self harm, so it's then finding something appropriate.
Services aren't supposed to use bribery because of autonomy.
I think the thing that stands out in this case is the inflexibility of sectioning for people with a complex diagnosis. There should be more family involvement, if possible, for the social/leisure side of the care plan.
That does also mean flexibility in the benefit system, so the carer is still recognised as a carer.
Hundreds of thousands of NT people are dying because they are eating/drinking/smoking themselves to death. So we get into the ethical dilemma of allowing autonomy and what we actually do to force people with LD/MH issues etc to comply.