Over the years, Harley has become well practiced in patching up various kinds of wounds. She’s pretty much entirely unaffected by blood or burns or broken bones, and was often charged by Joker with dealing with injured henchmen. She’s also pretty talented at quickly stitching up wounds, having had to stitch up herself before, as well as injuries Joker couldn’t reach after fights with the Bat, or after beatings from Arkham guards during their time in the infamous Asylum.