McCullough played gave concerts, including her own compositions in the program of piano music. "Genius is the only fitting description of this remarkably talented young woman", according to a 1936 report, remarking especially on her own works, "Hawaiian Rain Shower" and "E Flat Sonata", and her rendition of
Samuel Coleridge-Taylor's "I'm Troubled in Mind". She joined the Los Angeles Musicians Association in 1931. She accompanied singers
Florence Cole Talbert and
Lillian Evanti. In 1937 she visited Hawaii to give performances and study at the
University of Hawaii. In 1940, she and singer
Tomiko Kanazawa gave a concert together at the Wilshire Ebell Theatre, to benefit a tuberculosis rest home in
Duarte, California. McCullough also taught kindergarten in Los Angeles, and worked with principal
Bessie Burke at the Holmes Avenue School. She sometimes gave lectures on Hawaii to community groups, after her studies there. Because she was a member of the board of the Musicians' Congress, her name came up in a state Senate report on "un-American activities in California". ==Personal life==