Who is Margaret O'Fallon from Mrs. Mike the Story of Katherine Mary Flannigan and what is their importance?

Margaret O'Fallon is Katherine's mother, who sends her daughter off on her adventure with the blessings of Katherine's doctors. She sends Katherine to Alberta so the cold dry climate can help her daughter's pleurisy. When Katherine returns to Boston after four years, her mother wants her to stay in Boston with them. She does not think the geography of Canada's Northwest Territory is fit for a young woman raising a family. She feels that Katherine's happiness will come from civilization and not the wilderness. She no longer knows her daughter at the end of the novel and vice versa.