The Gillmores visited pre-War Europe where she met Russian revolutionaries and French impressionist painters.

She published her first novel, June Jeopardy in 1908 and soon after became fiction editor of The Masses, a left-wing monthly magazine.

[8] William Henry died in 1948 and she moved to Scituate, Massachusetts, where she remained until her death at the age of 97 on September 25, 1970.

[10][11] Angel Island was republished in 1988 as a "classic of early feminist literature" with an introduction by science fiction and fantasy author Ursula K. Le Guin.

[11] Her fiction often addressed feminist issues and the plight of women, including divorce, single parenthood and problems in the workplace.

[9] Her 15-book "Maida" series of children's books was written over a period of 45 years, and tells the story of a school girl whose mother has died and whose father is very wealthy.