As a young adult, Tinker joined the Woman's Political Union, an organization dedicated to promoting women's rights.
[2] Tinker was a practiced equestrian, and organized multiple parades and marches of women on horseback in support of a woman's right to vote: Tinker was also known to comment on a woman's involvement in wartime, making statements about the need for women to fight alongside men, "scandaliz[ing] elite society" with these comments.
[2] After her father died unexpectedly in 1915, she sailed home for his funeral, and then returned to Europe to serve for the remainder of the war.
[3] A portrait of her at the age of fifteen shows her in a man's smoking jacket, "flaunt[ing] convention".
[1] In her will, she bequeathed a sum of two million dollars to form the "Annie R. Tinker Memorial Fund", with the stated purpose of providing help to "women who have to work for a living".