You can't just tell her blah blah what you do is bad and stuff. It obviously doesn't work.
If you want to help her teach her other ways to express herself to get the attention or what ever it is she needs.
I don't care to watch her vids, but maybe she has other talents, that she can make vids about?
The most straight forward thing for her would be to make vids about how she is overcomming her anorexia and admits that she was wrong and shows that it's never too late to change yourself bla bla you know this corny bulls***, people love and I'm sure if she does this it would help and inspire a lot of her fans and maybe save some of her victims.
I'd tell her myself, but I don't care about her and it has to be done by someone like you with enough voice power and/or a lot of people and not in a blaming way. She is obviously very defensive about the whole thing.
So if you really want to help her - and not only want to show of how smart and right you are, what you definitely are and what's also way more entertaining than the stuff I suggest here, but it's not very helpful ;P -show her that there's more to her life than killing herself and others or at least make suggestions or start something that makes people come up with something.
When she's found something new that fullfils her needs, she'll be more open towards suggestions regarding her anorexia.
And if you have a hard time to understand why she is like this try to imagine this: You are an asshole and you love being an asshole and lots of people love and/or hate you for being an asshole. You need this attention for money and also because that's how humans work. But being an asshole is also the only thing you're good at, so you work really hard on being an asshole and become an even bigger asshole. In the end you completely define yourself as an asshole.
Now there's a problem. More and more people start telling you that being an asshole is bad for your health it even turns out there is sicentific evidence that it's bad for your health. Can you really give up being an asshole so easily now just because everyone tells you that it's bad for your health? I mean it's your identity you worked hard for this. Maybe they are wrong. Sience often is wrong too. Facts aren't that important anyways it's more important what feels right! (ahh I love humanity) Even if you want to what are you going to do after this? How do you get the stuff you got through being an asshole and got used to? Everyone only tells you should stop being an asshole and how wrong you are, but do they really care about you? why should you listen? If you at least had an alternative you could express yourself through, like being funny or a singer or what ever, you'd had something to resort to and maybe find a new way to get what you need and over time aren't dependant on being an asshole anymore.
I know you woul'd stop being an asshole when facts tell you it kills you and other people, but it's not about you it's about her and she can't.
I'm not sure how this mail/forum thing works so I addressed Onision directly, but I'm also interested in opinions of some people who cared to read this text. xD