Depends on what version of Harley you're talking about. The original one from Batman: the Animated Series showed that she actually did have morals, she was just totally in the sway of the Joker. Batman was able to convince her to help him more than once by appealing to her good side.
Harley in the self-titled Harley Quinn cartoon definitely has a good side, but she's also a psycho. It's complicated. Unlike her love for Ivy.
Other versions, they definitely lean in on the "Joker except a woman" angle.