Olson was signed to a film contract by
Paramount Pictures in 1948, and after a few supporting roles, producers began to consider her for more prominent parts. She was up for the role of
Delilah in
Cecil B. DeMille's film
Samson and Delilah (1949), for which Olson later said she was not suited. She was passed over in favor of
Hedy Lamarr. Her first big role came in
Canadian Pacific (also 1949) with
Randolph Scott, then
Billy Wilder cast her for his upcoming project. In
Sunset Boulevard Olson made several appearances in films for the
Walt Disney studio.
The Absent-Minded Professor (1961) and
Son of Flubber (1963) paired her with
Fred MacMurray and were popular with movie-goers. She also appeared alongside
Hayley Mills in
Pollyanna (1960),
Glenn Ford in
Smith! (1969), and
Dean Jones in
Snowball Express (1972). Throughout the 1960s and 1970s, she did guest roles on television. Olson guest-starred on the television series
The Big Valley playing
Ron Howard's mother in the December 1, 1965, episode titled "Night of the Wolf". Olson is the only guest starring on
The Big Valley to marry the character Nick Barkley. Olson has been retired since the mid-1980s, although she made a brief, uncredited appearance in
Flubber, the 1997 remake of
The Absent-Minded Professor, and
Dumbbells (2014). In 2022, she released a memoir,
A Front Row Seat: An Intimate Look at Broadway, Hollywood, and the Age of Glamour. ==Personal life==