From 1937 until 1948, Marsh appeared in motion pictures with Metro-Goldwyn-Mayer, including a small uncredited part in Gone with the Wind.

[5] She was hired primarily because she was similar in height and build to Garland and even received her own pair of ruby slippers.

[9] In 1947, Marsh was named Miss Sky Lady of 1947[10] and began appearing in fewer films to focus on her new interest in dance.

[citation needed] After appearing in an airshow as Miss Sky Lady, she took flight instruction classes, learned to fly and later dropped leaflets of her acting profile on various movie studios in Hollywood.

[7] On March 6, 1949, Marsh, along with singers Delora Bueno and Louise Howard, appeared on the Ted Steele Show.

[14] As of 2024, she is one of a few known surviving personnel to have worked on the film, outliving all major cast members, original Tin Man Buddy Ebsen, adult Munchkins, and several extras.

[10] On September 28, 1950, Marsh married Bill Doll, a press agent to theatre and film producer Mike Todd.