In 1943, Rozenszajn's mother Bela obtained documents identifying her as being Catholic Polish, named Paulina Pakulska, which she used to escape Białystok with her daughter and begin working as a maid in Tykocin. However, in late 1943 or early 1944, Bela was arrested as a partisan, leaving Rozenszajn abandoned on the streets of Tykocin. She was found and taken care of by Lucyna and Wacław Białowarczuk, who had no children and raised her as their own, covering her dark hair in public, and bringing her to pray with them at the Catholic church.