harley has grown tired of being treated like trash by joker, and being ignored by him, if anything she thinks he has feelings for Batman more than he does with her, and so it’s lead her to gain a habit of eating when she gets bored, she barley giggles, does gymnastics, or even go out with joker to rain hell on Gotham, and so it’s lead her her gaining weight, her body more wide, her face puffy, her belly pudgy and a lil round, her and thighs and rear and bust thicker and jiggle with her jumpsuit starting to strain a bit, one day jokers noticed her sudden weight gain and made a rude comment about it that which made her leave near to tears and join her fellow female villains

Harley: and then he said I looked like a pig..that’s not true right? I mean yea I gained some weight but I’m not obese