Moore was born in New York City on December 30, 1902, to immigrant parents of Scottish and Irish descent.

[1] Starting in 1927, she appeared on Broadway in such plays as A Lady in Love, The Trial of Mary Dugan, Cross Roads, Torch Song, Twentieth Century, Phantoms, Conflict, Anatol, and Jarnegan.

[1] In 1935, Moore arrived in Hollywood and made her screen debut in an uncredited but substantial role in the Cary Grant-Katharine Hepburn film, Sylvia Scarlett for RKO Radio Pictures.

Moving back to New York City, she made one final performance onstage, creating the role of Mrs. Van Daan in The Diary of Anne Frank.

[8] In 1977, David Ragan wrote in Who's Who in Hollywood that Moore "is retired, lives alone at an excellent hotel on Park Avenue, and is in her late 60s".