[It's stranger, waiting for her mother (who doesn't remember being her mother) in the store she started. Upon getting there she actually finds herself at a loss for something to do instead of standing around nervously to see her mother a second time in this manner.
So she starts watering the plants that need watering, taking her time to keep herself occupied. This is what she's doing when Yuuki opens the door. Ai looks up at the knock and moves to put the watering can down.]