During World War II, she undertook leadership of the National Assembly's Race Unity Committee and of efforts to expand the religion into Mexico, Central and South America.
Among the two highest priority were undertaking ʻAbdu'l-Bahá's call through the Tablets of the Divine Plan to spread the religion throughout Central and South America and to address racism in the United States.
Baker was named chair of the Inter-America Committee of the Baháʼí National Spiritual Assembly of the US, responsible for many aspects of an initiative to expand the religion into Central and South America.
[4] In 1939 she was appointed by the national assembly to the Race Unity Committee, along with Louis George Gregory, an African-American lawyer who was a strong proponent of the religion.
[4] Starting in 1946, following World War II, Shoghi Effendi drew up plans for the American (US and Canada) Baháʼí community to send pioneers to Europe.
They were to elect members of a regional assembly to oversee expanding Bahá'i across Mexico and into Central and South America, and to the West Indies.
Baker was on the program along with ʻAlí-Akbar Furútan, Ugo Giachery, Hermann Grossman, ʻAlí-Muhammad Varqá, George Townshend, and Dhikru'llah Khadem giving a wide variety of talks and classes across 7 days.
[15] Baker made her Baháʼí pilgrimage just before the conference after delaying it twice in earlier years in order to provide service in her travels.
[5] At a follow-up conference for the initiatives in Europe, in Stockholm in August 1953, Baker asked for a Baháʼí to settle in Andorra and French-born William Danjon Dieudonne volunteered.
[16] Baker spoke at a variety of events in India extending her stay twice to speak at schools - her last public talk was in Karachi in early 1954.
[17] In January 1954 it was announced Baker had died in a plane crash near the island of Elba en route to Rome from Pakistan where she had toured after helping an international conference in India.
She had had plans to continue her trip from Rome to Paris, New York, and from there to a pioneering post with her husband Frank Baker[5] in St. Charles, Grenada, West Indies.