<P> She co-starred with comedian Imogene Coca on Broadway in The Girls in 509 . In October 1963, she and Ruth Gates appeared in a one - act play, Opening Night, which played in off - Broadway . Wood portrayed Fanny Ellis, a once famous star who prepares for a performance; the play lasted 47 performances . Ruth Gates was Aunt Jenny on the "Mama" series with Wood . </P> <P> She returned to movies in the 1960 CinemaScope production The Story of Ruth in a co-starring role, as what she referred to in her own book as a "blonde, blue - eyed Jewess". </P> <P> Her final screen appearance was as the gentle, wise Mother Abbess in The Sound of Music (1965), for which she was nominated for the Academy Award for Best Supporting Actress and the Golden Globe Award for Best Supporting Actress - Motion Picture . She was thrilled to be in the movie although she knew that she could no longer sing "Climb Ev'ry Mountain". She was dubbed (for singing) by Margery McKay . In her autobiography, Marni Nixon, who appeared in the film as Sister Sophia, said Peggy especially liked McKay's singing voice because she sounded as Peggy did in her younger days . </P> <P> In 1969, Wood joined the cast of the ABC - TV soap, One Life to Live as Dr. Kate Nolan and had a recurring role until the end of the year . </P>

Who sang for mother superior in the sound of music