Canary nodded once at Batman- the plot continued to thicken- and then nodded at Gordon by way of parting, "Thank you for your help, Commissioner."
She didn't add that she'd be safe (because that was really a rather blatant lie, given the whole 'breaking into Arkham, twice' thing), but she did slightly tip her head towards Batman as if to say that she was in good company. And hopefully Jim wouldn't call Barbara and ask her just what the hell was going on-- because then Dinah would really be in trouble.
She was already starting for the fire escape so that she could climb down to her bike in the alley below.