So thought it better to come home and have a quiet evening. Mrs. Vandemeyer said nothing, but she drew back and let Tuppence pass into the hall.
Mrs. Vandemeyer kept quiet and let Tuppence walk. 
mnli hypothesis: Mrs. Vandemeyer kept quiet and let Tuppence walk.  premise: So thought it better to come home and have a quiet evening. Mrs. Vandemeyer said nothing, but she drew back and let Tuppence pass into the hall.