I think my sister might have disordered eating but I'm not sure how I should bring it up. How would you bring it up?

Anonymous
My little sister is 23, she just started grad school, and has been really busy. She moved into my place because I had an extra room. I'm 11 years older than her and my fiancé lives with us but has been out of town helping her family. We've always been pretty close because our mom past away when we were kids. Since my fiance has been gone, I've realized that my sister barely eats. I buy groceries for us and I'm the only one who ever eats them. We used to hangout and watch TV but i've noticed she just isolates herself in her room. I help her manage her money and I looked at her credit card bill and she hasn't been eating out. She might just be studying and stressed over school but it doesn't seem like her. I've asked her to go get dinner and stuff but she always says she's too busy. She looks like she lost a fair amount of weight. I talked to her boyfriend about it but he said that he gets off of work so late that it's hard for him to notice if anything is going on. I feel that I need to say something but I don't want her to get mad at me. She's been working really hard and i don't want to stress her out more. How should I talk to her about this?
I think my sister might have disordered eating but I'm not sure how I should bring it up. How would you bring it up?
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