Her own mother said it helped her and I don’t think it’s ok to over rule her mother, if she said it helped her, then it helped her.
It is possible that BB helped profoundly in one way in a very palpable sense, while also not helping in another.
To recover from an eating disorder, somebody has to find something else they want more, that ultimately is more important and powerful to them than then eating disorder, and breaks the spell. It's not enough to 'just' not want to have an ED. You need to actively REALLY want something.
I think a celebrity lifestyle and the opportunities that went along with that, possibly presented something really powerful - like how exciting and fun life and the world could be, if you are well enough to enjoy it. It shows another side of life very different to the drudgery of trying to cope with and survive anorexia, hospitals and doctors and health problems and worry and family tensions.
But then fame comes with a whole host of challenges and shit very specific to that lifestyle, and the stress can 'spoil' the good bits and trigger mental health issues.