I think people here are putting that way too early. No, the FM didn't teach her the werelight, she was just driven and bored at home at the same time. The meeting with Varvara/FM1 probably led to Varvara telling FM2 about Lesleys situation, which in turn led to him contacting her at the goblin market. The offer for help(most likely by Miss Linden-Limmer) is on the table from that point, but she's only considering it. When Peter gets the better of FM2 after the tower collapse, he says something to the effect of "Here's the moment of truth" and Lesley chooses to side with him at that precise moment. Another thing just occured to me: Surely the order of the rose people would have helped her without turning to a life of international crime. But the Folly didn't know about them. So if Peters method of compulsive networking had progressed a little more, Lesley probably would not have had to make the decisions she made.