Theoretically, it should be simple enough- what you'd need is something to essentially 'shove' you back to a certain point. The trouble would be more in finding something that could do that. [There might have been something big and spiky in her thought bubble, but it's swiftly shoved aside for a guy in an overcoat and bowler hat- more because she's not really dealing with that at the moment than that she's realised the bubbles are there.]