Lyman was called as a member of the general board Relief Society in 1909. She served for two years, and served as assistant secretary for two years. After that, she was the general secretary-treasurer for 15 years. She helped the Relief Society use more modern practices like office machines and filing systems. She also collected minutes from their meetings and other historical documents. While on the general board, she established Social Service Department under Joseph F. Smith's authorization. From 1928 to 1940, Lyman was the first counselor to president Louise Y. Robison in the Relief Society general presidency. As a counselor, she transferred stored wheat collected under Brigham Young to the General Welfare Program. She also assisted in the centennial celebration of Relief Society. Lyman succeeded Robison as president in 1940 and served until 1945.