Daughter of actress Freda Jones.
First husband was a lieutenant commander in the Merchant Marine. She had two boys. Second husband was TV writer Bill Davenport ("Hogan's Heroes" (1965)).
Interviewed in "Growing Up on the Set: Interviews with 39 Former Child Actors of Classic Film and Television" by Tom Goldrup and Jim Goldrup (McFarland, 2002).
She was originally cast to play Becky Thatcher in The Adventures of Tom Sawyer (1938), but after a growth spurt, the studio thought she was too tall for the role and recast her as Mary Sawyer.
Son Denny was born in 1945 and son Tim in 1947.
The daughter of a persistent stage mother, Marcia developed personal and emotional problems later in life, which triggered a severe alcohol problem. She later received a degree in religious science and completely conquered her dependency.