I know y'all don't like her because she's been super self righteous about her illness, but dragging her for relapsing doesn't make you any better than her.
Considering her long and storied past with eating disorders I highly doubt she would've liked that intentionally. I'm sure she knows how people would see her (see: pretty much every other comment in this thread) if she were to do a completely public 180 on the issue, especially over the course of just weeks. And even if it weren't an accident and she's really "endorsing" anorexia, the last thing she would need right now would be our scorn. Relapsing on an eating disorder is hardly a choice.
I'm sure it was just an accident. It's far too easy to accidentally like a pic on Instagram, though how on earth she managed to stumble on that post in the first place is beyond me.