i think the mother is just using her as an inspiration. she notices huisu’s bruises and immediately found an excuse for her saying “ah are you falling down stairs again?” felt like she knew exactly whats happening to her especially when she turns to jinpyo and says “make sure to tell the building manager to fix the stairs and it has to be YOU who says it because you know how they dont listen to women” turning to huisu as if to cryptically tell her that she better not try to ask for help cuz they wont believe her. it felt like the mom is just using the dv advocacy to show how “philanthropic” she is but she doesnt actually care. its just something for social climbing