A reaction to her sudden sense of his ubiquity, if not yet actual then potential. Once he was established in your life, he’d be there, in some way no ordinary person, no ordinary boss, even, could be. Once she accepted him, past a certain point, there was always going to be the possibility of him ringing her up, to say "Just checking," before she could even ask who was calling. Did she want that? Could she afford not to?