She had a free period, the boys were in Divination. Draco had been summoned by Umbridge, so she went back to the common room, duplicated her notes and figured she’d leave them by their beds. When she got up there, the room was a mess. Their trunks were half in and half out. She decided to ignore it but then she saw that Harry’s trainers were mixed with the clothes - now that! That was unacceptable!