Some more about her acting career:
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In 1940, a young Davis had appeared as a National Foundation for Infantile Paralysis volunteer in a memorable short subject shown in movie theaters to raise donations for the crusade against polio. ... It was very effective in raising contributions.
...
Following her graduation from college, Davis held jobs in Chicago as a sales clerk in Marshall Field's department store and as a nurse's aide.
With the help of her mother's colleagues in theatre, including Zasu Pitts, Walter Huston, and Spencer Tracy, she pursued a career as a professional actress. ...
She landed the role of Si-Tchun, a lady-in-waiting, in the 1946 Broadway musical about the Orient, Lute Song, starring Mary Martin and a pre-stardom Yul Brynner. ...
After passing a screen test, she moved to California and signed a seven-year contract with Metro Goldwyn Mayer Studios (MGM) in 1949; she later remarked, "Joining Metro was like walking into a dream world." Her combination of attractive appearance – centered around her large eyes – and somewhat distant and understated manner made her hard at first for MGM to cast and publicize.
Author Garry Wills believes that Davis was underrated as an actress overall because her constrained part in Hellcats was her most widely seen performance. ...
After her final film, Crash Landing (1958), Davis appeared for a brief time as a guest star in television dramas such as the Zane Grey Theatre episode "The Long Shadow" (1961), where she played opposite Ronald Reagan, as well as Wagon Train, and The Tall Man, until she retired as an actress in 1962.
During her career, Davis served on the board of directors of the Screen Actors Guild for nearly ten years.
Decades later, Albert Brooks attempted to coax her out of acting retirement by offering her the title role opposite himself in his 1996 film Mother. She declined in order to care for her husband, and Debbie Reynolds played the part.
https://en.wikipedia.org/wiki/Nancy_Reagan