She just leaves. Another fat Superheroine comes in...

"ah well, not my problem" Fat Harley thought to herself, "better go find the skinny me, wonder if she's hidden in the all you can eat buffet"

As she waddled off her thinner self just lay there, wallowing in the filth that enveloped her, still unconscious from the stench she was surrounded by, it wasn't until a thunderous belch from the next stall over shook the walls of the bathroom that she jolted awake to be reminded of her situation, she began to struggle and shift around in the gigantic pile she was trapped in, eventually managing to at least break her head and arms a bit more free of the pile, she began to slowly and methodically dig and pull herself out of the tower of turd that she was quite sick of being inside of, her clothes now stained forever she swore that the first thing she would do once out of this was find herself what passed for a shower in this place and never leave it for a good year or so.

Suddenly the cubicle opened, Harley looked up and made a point to shout at the new arrival to make sure she wasn't about to be resealed in her poop prison when she saw who it was who had entered