She joined a group of Soviet partisans, being renamed Sonia in case she was captured, and helped fight against the Germans.

She spent the rest of life in public engagement, speaking about her experiences and in 2009, published her autobiography, Here, There Are No Sarahs: A Woman's Courageous Fight Against the Nazis and Her Bittersweet Fulfillment of the American Dream.

Unable to join her brother's partisan group due to her gender, Sonia hid in the forest with her parents and uncle during the winter of 1942 to 1943, keeping on the move and remaining hungry, cold, and unclean with lice.

[2][3] In exchange for her uncle's knowledge of the area, Soviet partisans accepted them and renamed Sarah as Sonia to sound more Russian.

[2] She recounted her experiences in her public talks[4] and in 2009, published her autobiography Here, There Are No Sarahs: A Woman's Courageous Fight Against the Nazis and Her Bittersweet Fulfillment of the American Dream which was co-authored with Fred Rosenbaum.