She served on the executive board of the Massachusetts Political Equality Union, and was a member of the American delegations to the International Congress of Women meetings in The Hague in 1915, and in Zürich in 1919.

[3] Withington worked at Jane Addams' Hull House settlement in Chicago as a young woman.

[9] In 1908, she supported William Jennings Bryan's campaign for president, saying "I think the intelligent suffragists have decided personal opinions on political matters and, therefore, it would be disastrous to the woman suffrage movement for them to commit themselves to either party.

"[10] In 1909, Withington contributed to a Boston Globe feature on "Why Women Wage Earners Should Organize", alongside Emily Greene Balch, Margaret L. Foley, John Golden, John F. Tobin, and Henry Sterling; she wrote, "Women have always done more than their share of the work of the world, and now, for the first time, they are beginning to realize its value.

[4] In 1927, she was a delegate to the First Pan Pacific Conference on Education, Rehabilitation, Reclamation and Recreation, held in Honolulu, where her older brother lived.