Loranger left school at the age of 15, there being no public education provision in Québec for girls at the time. At the age of 17 she was writing short fiction for the magazine Revue Populaire. She started writing radio scripts in 1938, often collaborating with the poet, novelist and playwright Robert Choquette. In 1949 she published her first novel, Mathieu, which was a success with critics and the public. In the 1950s and 1960s she wrote many TV dramas, notably the series Sous le signe du lion (1961–62). In 1965 she turned her attention to the theatre with the play Une maison … un jour, which toured France and Russia. She won the 1967 Governor General's Awards with Encore cinq minutes in the French "poetry or drama" section.