Although Keath was better known for her work in radio, she performed on stage in The Playboy of Newark at the Provincetown Playhouse in March 1943.

[1] She also played the character of Irene Halenczik in the short-running Broadway production of Sophie in December 1944.

[2] Keath gained fame playing the character of Lynne Dineen in the long running soap opera radio program Young Dr. Malone (1939 -1960).

[2] According to Keath, the project was broadly educational: “We are willing," she said, "to use the talents by which we make a living to explain the significance behind the headlines.”[3] In 1943, she co-authored Leave It As You Find It with Andrew Rosenthal.

A few years later, the New York Times noted that Keath had co-authored an untitled piece with playwright Alden Nash, which was eventually registered for copyright in July 1946 as a three-act play entitled Soon the Morning.