She's definitely not the best. I liked her a lot more in Suicide Squad though. I figured for the next movie they would double down and make her more traditional in both appearance and behavior, but they sought to make her further from the source material. Particularly in appearance, she is nearly unrecognizable as Harley Quinn.

From what I've seen David Ayer is still signed on to direct that, and Margot Robbie is still attached. There doesn't seem to have been any progress on making it lately though. She said in an interview that she chose to do Birds of Prey first over Sirens.