Then I'll go to bed directly after supper. She went into the boudoir again, and Cynthia stared after her. 
They finished supper and she went directly to bed, while Cynthia stared after her. 
mnli hypothesis: They finished supper and she went directly to bed, while Cynthia stared after her.  premise: Then I'll go to bed directly after supper. She went into the boudoir again, and Cynthia stared after her. 