>>/132235/
I think I have an idea of what's happening. She developed an eating disorder because she has body dysmorphia and when she sees that picture and it's no longer demonstrative of her current appearance and she's proud to have lost that weight, it's almost like an OCD compulsion to correct the opinion of those who might think that's current. 
As far as her being fake, I'm not really sure what's fake. She mostly just shit posts. But you may have seen more of her posts than I have to develop that opinion so I can't argue that whatsoever.