During the Nazi occupation, she was active in the underground, using the pseudonym "Leti". From 1943, she was a liaison officer at the Main Headquarters of the Home Army, where she was assigned to Oddziału VI BiP of the Biuro Informacji i Propagandy (Division VI of BiP, the Information and Propaganda Office). She was a member of the editorial board of the Biuletyn Informacyjny.