The illusion of “support” from being around others with the same issues, where secretly it can become a competition to become the most extreme/fucked up/sick (etc), is a modern catastrophe for a lot of troubled young people.
Least controversially (for now) it’s seen in communities around eating disordered behaviour, where people learn new pathological behaviours from one another, spur each other on, form a community that obsesses upon the very thing they could do with thinking about a lot less (weight, body image, food) and almost always, compete to be the most damaged, simultaneously crying “we’d never wish this on anyone!!1!” - whilst basing their entire personal identity upon it, and defending it as a culture in its own right.
You could try speaking to her Higher Self and asking them to make conditions and guide her to insights that modelling healthy behaviours would be better for her. The simplest way to do that, is to adapt this advice I gave someone to your circs:
I will beg your attention to this very strong caution though:
when dealing with anyone’s HS, even your own child, treat them with respect and keep a certain distance, make your case and then try to resist ongoing contact with the HS unless you are asked, by the HS, to contact them more often, or unless you have a compelling reason to remain in contact.
They’re not on our plane for a reason, and interacting too much is not advisable, in general.
But a few carefully chosen contacts, to state your case and ask their assistance, should be completely possible and safe. 