Harley Quinn decided to come to you for help. You were a person close to the batfam, even Batman trusts you, so seeing as you have all this trust, she comes to you too.

"The bat even trusts you too, huh? Wowzers! I guess he's starting to build a life!"

She'd shrug with a cheesey smile, but she knows you're not buying her little rant. You know she wants help

"Finee, you're not really a birde or a Bat, but! ...I came for advice.."