[Of course she knows. It doesn't speak well of her at all that she keeps taking advantage of it, like he's some errand boy. She lowers her gaze as she nods, quietly accepting his words without comment. On a safer note:]
You know, it's hard to believe work would be the end of your social obligations.
[It's not an accusation: she says it lightly; it's more of a slight joke as well as a "you seem to have so many friends".]