During the German occupation of Poland, Juno was a Gestapo informant; in a raid by the Home Army in 1943, her husband Kazimierz Junosza-Stepowski was killed while trying to protect her.
During the occupation, she became addicted to drugs, and probably without her husband's knowledge, she became a Gestapo informant.
She was active in theatre and film in the early 1920s.
In the early 1920s she was active in theater and film.
In March 1944, returning to her apartment after a period of refuge, she was shot and killed by Home Army members.