You don't know she has an eating disorder. All you've seen is facebook pictures. It's kind of rude to assume something like that about someone, when you haven't even seen them in years. She could be sick. There are all kinds of things that can make a person lose weight, have dull skin, thinning hair, etc.

You need to see her in person before making these kinds of assumptions, and then try to help her get professional help if you're sure. Maybe talk to her family members. But don't accuse her of anything, and don't pressure her. You'll only make it worse.

**EDIT** I got really off topic, but I felt it was something I still needed to admit to people. So don't look at this as advice, this is just me trying to make sense of me.

I struggled a bit with disordered eating but it was more a symptom of my mental illness than an actual eating disorder. For me I did stupid things for attention and I want to explain the mindset behind that. At least how it was for me.

I pulled a few really stupid stunts for attention. I wanted people to see just how bad it was for me mentally. Because I couldn't find a way to articulate "I need help" I tried to force their hand by trying to get them to save me. I look back and cringe at some of the things I've said or done. The issue was that I also hated to be confronted about my problems. I was a master manipulator and an accomplished liar. All of which I now understand is part of my mental illness (borderline). I hated drama but thrived on attention. I destroyed so many friendships.

What helped me was non-confrontational conversations that weren't face to face. I found it easier to open up and be honest if I didn't have to see disappointment or horror in their face. I'm still that way. I find myself lying to my therapist constantly because I can't face her thinking I'm weak. I know it doesn't make much sense but that's just how I am.