She was discovered dancing with a Stockholm ballet company by director Joseph W. Sarno.

At seventeen, she began her film career with the lead role in Sarno's Inga (1968), which transformed her into an international sex symbol.

[1] Her other film roles included Eugenie in Eugenie… The Story of Her Journey into Perversion (1970) and Sibyl Vane in Dorian Gray (1970).

[2] She grew weary of the film industry and retired from acting at the age of twenty-one.

Liljedahl appeared in two Playboy magazine pictorials: "The Girls of Scandinavia" (June 1968) and "Flicker Flicka" (March 1969).