It was because of things like this (Steel freaking shutters, for crying out loud! She almost never saw those outside of bank vaults!) that the Cat made a point of identifying all possible exits in the first place and made a point of double checking them once things went south. At the moment, there was still one exit possibility she could utilize but the downside was that she probably couldn't get the painting out that way. It was quickly becoming obvious to the Cat that while she still stood a chance of escape, it was unlikely-to-practically-impossible that she'd manage to bring the desired loot along with her. Potts was too invested in keeping it on her wall.
But then again, the Cat supposed she could use that investment to her advantage somewhat, as well. Her smile grew wider as she reversed the motion of her hands, now unrolling the canvas once more as she spoke, "That's because I didn't give you my name, Ms. Potts."