Lucy hadn't even answered in the affirmative before the stranger started telling her she should have felt she could come back. She didn't feel quite right, accepting the apology when it hadn't truly been the war that had kept her from Diagon Alley. Nor, though, did she feel inclined to talk about the real reason she'd stayed away. Not here on the street with a stranger. "I knew I could come back," she said, when she could get a word in. "I mean, Professor Sprout wrote to say I could go back to school, if I wanted, but... I had a job by then, and..." And why was she spilling her life story? Lucy stopped.
As for what had brought her back, she couldn't entirely say. "Someone sent me a journal," she eventually admitted. "From... Finnigan's? It says that's on Monument Alley, but I don't know where that is." She'd never been overly familiar with wizarding London even while she'd still been at Hogwarts. After third year she usually found at least one free weekend to go and get anything she needed from the shops.