Rosing worked as a stage actress in Denmark, performing for three years with the Royal Danish Theatre.

During the early 1920s, she made one or two stage appearances on Broadway, including Fools Errant (1922),[3] while raising her children alone.

Rosing was under studio contract at MGM and often played matronly roles such as servants, housekeepers, cooks, or mothers.

She appeared as the wife of her Danish compatriot, Jean Hersholt, in The Painted Veil (1934) with Greta Garbo, replacing the originally cast Beulah Bondi to bring a warmer look to the role.

[6] She also played the German neighbor of Lionel Barrymore in You Can't Take It with You (1938) by Frank Capra.