Absolutely. This person is deranged. She is clinging to her fat identity and her internet popularity as an authority figure like her life depends on it. The sheer, hysterical, aggressive defensiveness she shows, especially when challenged, is grossly disproportionate to someone allegedly just trying to represent fat people and facts online. It's a coping mechanism for something much deeper. I think you're right and if it wasn't for this persona, she might literally lose her mind.