By the time Batman got back, Kimber already had the last man down and was snapping restraints on him. Apparently she had NYPD on the phone, and was speaking into an earpiece. "Lynx here. I have three men on the corner of Madison and East 53rd that you can pick up for armed robbery." No, no similarities to Batman or anything.
There was a time--back when Ollie was around--that she would've made a little quip, maybe jokingly warning the cops to watch out for crazy men dressed like bats. She wasn't nearly as much fun now, though.
She turned back to Batman as she approached. Thanking him would imply that she needed his help, which she didn't. Pointing out that she hadn't asked for his assistance, though, would come off as petulant and childish. So she just took a cue from Batman and looked at him silently, one hand on her hip.