When her movie role options began to dwindle, Gilmore left Los Angeles for New York City and started working on Broadway. In 1943, Gilmore played in Those Endearing Young Charms and The World’s Full of Girls. In 1944, she played the title role in Dear Ruth, which was directed by Moss Hart. Starting in the late 1940s, Gilmore had many television roles. In 1949, she and her husband, Yul Brynner, were featured on We’re On, an NBC television series. Between 1966 and 1968, she taught drama at Yale University. In her later years, Gilmore was a leader in Alcoholics Anonymous.