Who is Constance Beauclaire from Mrs. Mike the Story of Katherine Mary Flannigan and what is their importance?

Constance Beauclaire is the only other white woman besides Katherine in Grouard. While Katherine does not particularly like her reference to this fact when she first meets Constance, Katherine understands, at the end of the novel, why she states the words. Constance means that she and Katherine chose to live in this country but the others were born there.