She smiles. Don't worry. Once you start getting the facial cues, you'll be a master. If it helps you, a lot of Hearing people will say what they sign as they sign it. I think it kind of helps them to remember the sign they want to use. She shrugs as she turns the page back to face him. She can't really know if that's why, for sure. Her parents and her brothers didn't mouth the words — usually.