[Pidge has been making it a point to poke around and see what she can see and, unfortunately, she happens upon Izuku while he's dramatically monologuing at the door.

So she waits off to the side until it seems like he's finished, and after a moment, just starts clapping.]

Are you telling me that your plan is to... do whatever it is that you did before I got here twice a day for the forseeable future?