She performed extensively in Canada and the United States in the 1940s, and taught at the Royal Conservatory of Music from 1948 to 1952.
In 1950 she was the musical director of the Toronto theatrical revue Spring Thaw; she continued to be involved with the show during the 1950s and early 1960s, directing, writing songs for the show with Ray Jessel,[1] and playing piano.
[3] Grudeff and Jessel subsequently collaborated on songs for the Broadway musical Baker Street;[4][5] they moved to New York City, where the show ran more than 300 performances and received mixed reviews.
She resumed her concert performances in 1976, giving recitals in Toronto and Bulgaria.
During this time she worked as a musical director at Hart House Theatre, where she became a mentor to Don McKellar and Lisa Lambert, who would go on to create the hit musical The Drowsy Chaperone.