After the war, Hochberg-Mariańska was the head of the Child Care Department at the Provincial Committee of Jews in Kraków until 1948. She collected testimonies on the experiences of Jewish children under German occupation, subsequently published as The Children Accuse (1947). The children had primarily survived in hiding, often in forests and bunkers. Hochberg-Mariańska recorded their experiences of ghetto and camp life, resistance and survival. She was also one of the founders of the Jewish Historical Commission in Poland.
Under the name Miriam Peleg, she settled in Israel in 1949. She worked at Yad Vashem for twenty years. The account of her wartime experiences in Kraków was published as Witnesses: Life in Occupied Kraków (1991). She died in Tel Aviv in 1996.