She began writing for the national newspaper Aftonbladet and for the literary magazine Bonniers Litterära Magasin.

[4] She married artist and sculptor Ulf Trotzig[5] and lived in Paris from 1955 to 1969[6] with her husband; during this period she converted to Roman Catholicism.

[7] Trotzig was one of Sweden's most renowned modern writers,[8] having written several novels in which she gave voice to her Catholic faith (though her perspective is said to have been existential rather than Christian[6]) and her dark visions.

Among her novels are Sjukdomen ("The Illness") (made into the movie Kejsaren, "The Emperor," in 1979) and Dykungens dotter ("The Mud King's daughter") (1985).

She also wrote essays and articles on poetry, and works of prose poems: Anima (1982) and Sammanhang ("Contexts") (1996).