It was possible, yes. Though Laura was smart enough to realize that it was also possible that he wouldn't arrive. She felt that the the chances were better for him to not arrive. So she definitely wasn't going to be getting her hopes up. Better safe than sorry, or something like that.
"I can tell you anything you want to know," she told him. She had no hesitation with talking to Charles about her world, his future. She thought he deserved to know anything he wanted to know.