Her quiet has a clock in it. She lets the man finish the story, smiles at the one decent part, then looks away first.
At a table, you can spot the difference right away. Someone younger keeps filling every pause with extra words, extra laughter, extra proof that the conversation is still alive. This woman lets the silence sit there between the glasses.
She checks her phone once and puts it face down. Not nervous. Done. If he wants her attention again, he has to bring something better than volume.