After the Axis invasion of Yugoslavia and the persecution of Jews in 1941, she lived undercover in Belgrade under a false identity, Sofija Aleksić, working as a maid. She also continued working for the party and participated in the preparations the uprising. She was behind the organization of the rescue of Aleksandar Ranković, member of the Central Committee of the Communist Party of Yugoslavia, from the prison hospital in Vidinskoj street in Belgrade in July 1941.