However, after frequent bombing raids—and witnessing the death of a close friend—Evelyn and Kathryn moved to the safer, smaller area of Bangor, Wales.

[5] Beaumont made her feature film debut in It Happened One Sunday (1944), which drew interest from Metro-Goldwyn-Mayer, who offered her a contract.

"[7] In spite of this, she did play small parts in MGM's On an Island with You (1948), where she did a Jimmy Durante impression in front of Durante's character, a non-speaking, uncredited role in The Secret Garden (1949) and another uncredited role in Challenge to Lassie (1949), though she did appear on one of its film posters.

[7] Beaumont auditioned three times and received the role,[8] working under voice director Winston Hibler.

[5] Disney subsequently cast her in the voice role of Wendy Darling in their following feature, Peter Pan (1953).

[7] In addition to providing her voice, Beaumont also served as the performance model for both characters for live-action reference to help the animators.

[13] After completing Peter Pan, Beaumont enrolled in high school, where she joined a drill team and ran for a position in student government.

[7] Upon graduating from college, Beaumont worked as an elementary school teacher in Los Angeles for 36 years.