I think my friend has an eating disorder

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>5'7 Girl weighing 110 saying she wants to get to 100
>My mom freaked out when she saw a picture of her wearing a dress because of how apparent her ribs were
>Told someone this week she was trying to lose 10 pounds before a grad school dance
>Constant talking about how unattractive/fat she is and comparing herself to her sisters
>Told one of her other friends she doesn't like eating around other guys

She pretty good at hiding her problem if she does in fact have one. I'm probably her best friend and even though I'm a guy she eats around me all the time.

However the past week a lot of people have become very concerned, and I guess I am also. They've tried talking to her but she wasn't receptive to the idea.

They asked me to contact her father since we know each other.

Any /adv/?