… And she is right. Harley might be Joker’s girlfriend, or created to be his girlfriend, but she is still a character of her own. With her own past, motives, friends… She is part of the suicide squad, Poison Ivy’s best friend, was part of the Gotham city sirens, was in alliance with Catwoman, Batman’s villain and so much more. Harley is not just Joker’s girlfriend for a very long time, she is Harley Quinn, a character who is in a relationship or was in a relationship with the Joker. But she can have storylines who aren’t connected to him. Literally a lot of the btas episodes and comics show it:
Gotham city sirens, Harley Quinn (2000), suicide squad, Gotham girls, Harley and Ivy, our world at war, convergence and many more.
Yes, somehow it always leads back to Joker, but they are two different characters who are involved with each other, each of them with his own story. Harley is not a doll who stands quietly next to him, and i feel like that what you are trying to say. she is complicated and deep and she can have so many storylines without him, surprise.