Catwoman stopped dead when she saw Harley. And it looked like the two that she was following were after the same thing that Harley was after.
If this was the Harley she knew, then things could be a lot of fun. She'd always liked Harley. On the other hand, if this Harley was involved with Joker from this world, then Catwoman wouldn't want to deal with her.
What the hell, at this point, she could easily escape.
She stepped out of the shadows and keeping an eye on the two in the weird guys in the winged costumes, she spoke directly to Harley. "Harley, are you stealing things again? I thought that was my job." She couldn't help but grin a little at the situation.