The following morning, Mrs. Inglethorp stayed in bed to breakfast, as she was rather overtired; but she appeared in her briskest mood about 12.30, and swept Lawrence and myself off to a luncheon party. 
Mrs. Ingethorp had some business at the luncheon party
mnli hypothesis: Mrs. Ingethorp had some business at the luncheon party premise: The following morning, Mrs. Inglethorp stayed in bed to breakfast, as she was rather overtired; but she appeared in her briskest mood about 12.30, and swept Lawrence and myself off to a luncheon party. 