It was so obvious. Rose couldn't believe she hadn't figured it out earlier, hadn't even thought about it before. It was a trap. Dylan had never tried to help her, he was just following an order, and the order was to lead her to Madame Jocasta. Rose had to listen to the story they had created for her. Dylan and the witch had tried to convince her that Scorpius was evil, but that was part of the plan too: the same was happened with Aster and Stella, the information were used to indicate the Notts as those responsible for the murder.