Cissie's smile grows a bit; she's surprised that she feels relief. It wasn't that she thought Tim wouldn't believe her, but she was prepared to argue more to convince him.

"Honestly? I'm not surprised you don't remember. I don't know how or why I remember it, or anyone else. One of the facts of being in Wonderland was that whenever someone left, they didn't retain any of their memories of Wonderland. Sometimes people would leave and come back, and they would remember their time there--but only after they got back. They said they didn't remember a thing when they were home."