Where does Dorothy tell Hester Miss Rosamond is when Hester returns to the Manor House that Sunday in winter? Why does Hester worry?

Dorothy tells Hester that Miss Rosamond is in the drawing room with Miss Furnivall and Mrs. Starks. When Hester goes looking for her she cannot find her. Miss Furnivall and Mrs. Starks tell Hester that the little girl left over an hour ago to find Dorothy.