How can I help a friend after I caught her on a pro ana site?

Anonymous
I've been letting my friend stay with me for a while until she gets back on her feet. She uses my laptop from time to time. She works midnights, and I work days so we only see each other on weekends. I don't know much about how much she eats. I do know she is too thin. I also found a pro ana website in my history, and she visits it frequently.

I don't know how to help her or how to even bring it up.
Updates
+1 y
For those who don't know, pro ana sites are websites to get tips on how to be anorexic.
How can I help a friend after I caught her on a pro ana site?
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