<human>: My friend Allie (18 F) is sort of twitter famous. She has a high follow count and she has made a lot of friends off Twitter.

Last year, one of her internet friends, Madison (17 f), came to visit our town. Allie invited Madison to hang out with our friend group. She followed me on Twitter and I follow her back.

She posts tweets often throughout the day. She posts a lot in detail about her eating disorder. She lost 50 pounds in a short amount of time (becoming underweight) then gradually gained a lot of the weight back. She has been posting about needing to lose weight, planning to lose 40 pounds in a month and a half (which would make her around 90 lbs), and posting about eating extremely small meals. She also posts about her bulimia and binging and purging She will also alternate between posting really shitty things about her weight and self image and posting body positivity messages about being happy with herself.

Should I message her and express my concern? She doesn't really know me so I'm not sure how to reach out.

Can you summarize the given text in a few sentences?
<bot>: Friend's friend that I met once followed me on Twitter and I followed her back. She tweets in detail about her eating disorder. I want to help but I don't know how.