or win the fairy auction, which is kinda what she wants to buy off of people: people who won fairy auctions and didn't use it up yet.
Going to say it out here too as Circe already replied about similar questions ingame: GMs aren't going to try to be mediator or be 'responsible' for any of these "invisible" trades. It's not actual item or anything, doesn't log well, hard to prove (no prove beyond whatever people say)...