In 1944 she informed on a Germany army major to the Gestapo for allegedly making comments supportive of the 20 July plot to assassinate Adolf Hitler.[1] Following the defeat of Germany, Simson was arrested by the Soviet NKVD and placed in a series of detention camps. In 1950 she was sentenced to eight years in prison at the Waldheim Trials, but was given an early release in 1952 and moved to West Germany. She worked as a choreographer in some stage productions, and married the theatre director Wilhelm List Diehl.