Her younger sister Katharine Sergeant Angell White was an editor for The New Yorker and wife of E. B.
[1] In 1910, she wrote her first article, "Toilers of the Tenements," which she published in McClure's Magazine under the editorship of Willa Cather, thus beginning a lifelong friendship between the two women.
In 1916, she published her first book, French Perspectives, a result of her extensive travels to that country as the New Republic's war correspondent.
[1] In the mid-1930s, John Collier, Commissioner of Indian Affairs, hired her to report on Pueblo social conditions and reactions to the Wheeler-Howard Act.
Despite her ill health and failing eyesight, in 1960, she published the well-reviewed Robert Frost: The Trial by Experience Sergeant had planned to follow this with an autobiography, but she did not live to complete it.
Katharine held a memorial service for her on April 12, 1965, at the Cosmopolitan Club, at which Bryn Mawr College President Katharine McBride introduced the speakers, including Robert Frost's daughter, Leslie Frost Ballantine, and the writer Glenway Wescott.