In 1940, Fudem and her family were forcibly resettled into the
Warsaw Ghetto. There, she participated in cultural activities, including acting in a Hebrew drama club. Fudem also started participated in underground activities as a member of the
Jewish Combat Organisation (ŻOB), where she used the code name Lilit. The ŻOB was founded in October 1942, and aimed to better organise the Jewish resistance and prevent further deporations and protect the Jewish population of Poland. She maintained contact between the ghetto and the
Polish underground movement. Historian and
Holocaust survivor
Izrael Gutman later described Fudem in his autobiography as being one of the oldest and most experienced of the ŻOB's couriers. In 1942, Fudem's entire family was deported from the ghetto to
Treblinka extermination camp; her parents, grandparents, four of her brothers and her sister were murdered there. Fudem escaped the deportation by going into hiding. Her brother Leon became the sole member of the family to survive the Holocaust, and later testified about his family's experiences and fate at
Yad Vashem. == Warsaw Ghetto Uprising and death ==