Born Myrtle Monville into a Roman Catholic family in Hubbell, Michigan, Beall converted to the Methodist Church upon her marriage. She went on to have three children. Later she moved to Detroit, where in the 1930s she experienced baptism of the Holy Spirit; she knelt in the kitchen of her home one day and promptly began speaking in tongues. Soon she opened a Sunday school, and later began the Bethesda Missionary Temple. Bell said that in 1939, God revealed plans to her to "built an armory" where "soldiers" could be prepared to do battle for Christianity. As a result, her church, which had contained 350 seats, was expanded to hold 3,000 instead. Beall began broadcasts from the Temple in the 1940s, and made it the center of the Latter Rain Movement. Her group split with the Assemblies of God in 1949. By the end of her career Beall could be heard speaking on radio broadcasts three times a day. She was succeeded as leader of the movement by her son James in the 1970s.
- Randall Herbert Balmer (2004). Encyclopedia of Evangelicalism. Baylor University Press. pp. 63–. ISBN 978-1-932792-04-1.
- Susan Hill Lindley; Eleanor J. Stebner (2008). The Westminster Handbook to Women in American Religious History. Westminster John Knox Press. p. 14. ISBN 978-0-664-22454-7.
- Thackeray, Archibald (1 October 2013). "The Latter Rain Movement of '48: Mom Beall and Bethesda". Retrieved 23 August 2018.