Having settled in the United States following her marriage to Kaufman, MacGrath appeared in a number of American anthology television series popular in the 1950s, including The Philco Television Playhouse, Studio One, Lux Video Theatre, The United States Steel Hour, The Alcoa Hour, and Hallmark Hall of Fame.
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Born in London, England, MacGrath (pronounced mac-GRAW) began her acting career with a small role in the 1936 British film Whom the Gods Love, a biopic about Mozart and his wife Constanze.
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In 1951 she collaborated with Kaufman and Heywood Hale Broun on the writing of The Small Hours, which closed after 20 performances.