Who is Trudy Sawtelle from The Story of Edgar Sawtelle: A Novel and what is their importance?

Trudy Sawtelle is the mother of Edgar and husband of Gar. She is sweet, patient, kind, and attentive both as a mother and as a wife. She helps out on the farm, caring for and training the dogs. She loves her son very much, for her previous attempts to bear children ended in miscarriages.