Cant say I'm surprised. You look at that pic of her in her high school yearbook and now and it makes a lot of sense that she had a disorder, along with the fact that she's always covering up her torso whenever possible indicating she still suffers from body shame. I had an eating disorder when I was 15, fortunately my family intervened before it got really dangerous.
Rest and learn to love yourself, K$. Not every girl was meant to look like a Barbie doll, and that's okay.