After about 2:26 you don't see Elisa any more. She's already stepped out of the elevator and to the left where we can no longer see her. Then the door starts opening and closing a few seconds after that. Look at the wall each time the door opens. The color changes. Look for it to change to bright orange. The reason the door is opening and closing is because it's going from floor to floor because of her having pushed all the buttons.