As are Clayface and Poison Ivy. While the storyline is cute, I hate how incompetent the batfamily appears. They're used to fighting superhumans and shouldn't have quite this much trouble.
But, of course, if Harley's captured, the story ends, so the batfamily can't succeed. I only wish there had been a way to let Harley get away without the Batfamily seeming ridiculously incompetent.