To be fair they actually haven't, not in a movie. If they did an as-originally-written Harley Quinn the femoids would lose their minds. She's sexually attracted to the Joker because she gets off on him being wicked, and the Joker literally does not reciprocate or care. He abuses and manipulates and uses her for his own machinations and she thinks they're in this intense romance and he cares about her, but he basically doesn't give a fuck if she lives or dies. He'd strangle her to death himself if she weren't a lead character.

She's the opposite of a girlboss. She's a worthless dopey tool and a subservient simp too stupid to realize how fucked her situation is.