Most likely he was sending a note to say so.

As she took off her outer garment in the hall, she heard the footman, pronouncing his "r's" even like a _Kammerjunker_, say, "From the count for the princess," and hand the note.

She longed to question him as to where his master was.

She longed to turn back and send him a letter to come and see her, or to go herself to see him.