I think my girlfriend has an eating disorder?

Anonymous
So my girlfriend has always had really low self esteem. When we met she already didn't have a lot of self confidence and she was really shy.
I noticed she doesn't like compliment and doesn't accept compliment well. If I told her I thought she was beautiful she would keep denying it, or if her friend give her a compliment she would think she was lying. Anyways I would tell her she looked nice or pretty and she would always say " no I'm not, I'm fat". I would try and comfort her but eventually give up.
But lately I notice whenever we go out she won't eat, or if I offer to get her something she always reject saying it will make her fat. Or she says she not hungry. We did this overnight thing for school and she didn't eat the whole day, and whenever I offered her food she'd just say she's thirsty. I'm getting really concerned, she's starting too look kinda thin. When I brought up that she looked thin she got kinda happy.
She's not fat she just not skinny. Also all her friends are these tall sticks and she always says she wished she looked like them.
Also I don't really know if I can go to her parents. She only has her dad and he always tells her she looks fat and short, so he's obviously no help.
I just don't know what to do. I want to help her but I don't know how.
I think my girlfriend has an eating disorder?
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