During a short career of less than 24 years, Frische wrote 22 produced screenplays including five of the popular Far til Fire (English: Father of Four) family comedies and two adaptations of Morten Korch novels.

In accordance with her father's wishes, Frische began her career by studying English and History at Bedford, England rather than attending theater school.

Shortly after her return in 1938, Frische made her stage debut at Det Ny Teater as Fedosia in Opstandelse under the direction of her father.

Frische wrote novellas and radio plays and the book Vejen til Mandaley (The Road to Mandalay), however her dramatic talent was seen best through her screenplays.

Beginning in May 1945, Frische became a freelance screenwriter, working mostly for ASA Film for whom she wrote five of the Far til fire (Father of Four) family comedies.