The war pushed her toward
pacifism, and Royds joined the
Women's International League for Peace and Freedom (WILPF) and the
League of Nations Union (LNU). She also joined the
Union of Democratic Control as a part-time paid organiser and within a few months was hired in 1919 as the full-time secretary of the WILPF's London office. In 1921 Royds married George Alexander Innes, a fellow relief worker whom she had met in Salonika. Soon after her mother's death in 1922, the couple relocated to
Lewes in Sussex, where George worked as a partner in an engineering firm. Innes resigned as the London secretary of WIPF, but the organisation made her a board member to keep from losing her skill, necessitating monthly trips to London. In 1924, when his partnership ended, the couple returned to London. In the 1920s, Innes was active in promoting peace, serving as the referent for the
League of Nations, on the Board of the London chapter of WILPF, and as the secretary of the Society of Friends' Peace Committee. She continued to publish works, though on
internationalist ideals of the League of Nations, including:
The Story of the League of Nations (1925),
How the League of Nations Works (1926), ''The League of Nations and the World's Workers
(1927), The Reign of Law
(1929) and The Story of Nansen and the League'' (1932). By the early 1930s, she was serving as an honorary secretary of the London WILPF and was a proponent of using sanctions as a means to prohibit war. In 1927, Innes was elected to serve as vice chair of the London WILPF and remained in that capacity until 1934, when she became chair. Simultaneously, from 1926 to 1936, she served as secretary of the Society of Friends' Peace Committee. In 1937, she succeeded
Cornelia Ramondt-Hirschmann as one of the three joint co-chairs of the international WILPF and served through the duration of World War II along with
Gertrude Baer and
Clara Ragaz. ==Literary work and affiliation with the BBC==