She couldn't answer his simple question because she didn't have the first clue. The only plan she had was to try to figure out a way to get out of the Leaky Cauldron without being discovered. It seemed impossible. Augustus" quick thinking might have gotten her in, but she highly doubted a similar plan would work to get her out. She was afraid that Antonin was waiting outside the door to the room. What if his suspicious mind thought she was in there? Of course, there was the very real possibility that he would've already kicked the door down or blasted it off its hinges if he even suspected.