 When World War II erupted, she moved to Wilno (now Vilnius, Lithuania), where she was active in the emergency underground leadership of HaShomer HaTzair.Upon the Nazi invasion of the Soviet Union in 1941, she returned to Białystok, where she helped organize the underground movement in the Białystok Ghetto.She served as a courier between that ghetto and those of Wilno, Lublin, Warsaw and others.