There's no point investing money in a dead child.
If I was her parent, I'd be giving her nothing, it's not like she has any life or prospects ahead of her. Plus she clearly hates her entire family going by her attitude, it'd be hard to support her even out of love. She's done this to herself, doesn't want to get better and has utter contempt for anybody that loves her and only wishes to abuse and manipulate them in whatever capacity she can.
I'd say, best brush her off into the hands of the care home or wherever she lives. They'll deal with it.