Karmel was born to a middle-class Jewish family, Hirsch and Mita (Rosenbaum) Karmel, in
Kraków in Poland on August 14, 1925. She and her sister, Henryka, also to become a writer, were students at the Hebrew Gymnasium in the city. After living at several addresses, they were moved with their mother in 1942 to the
Kraków Ghetto, which was used as staging post for Jews to be transported to concentration camps. The three were then moved to the
Kraków-Płaszów concentration camp and, in 1943, sent on to the
Skarżysko-Kamienna concentration camp, which provided forced labour to the
HASAG munitions factory. A year later they were sent to the
Buchenwald concentration camp. Having survived their time in labour camps, which Karmel attributed to her mother's protection, the two sisters spent two years in
Stockholm while Karmel underwent rehabilitation, provided by the
Swedish Red Cross. Right at the end of the war she had been hit by a German tank, and suffered severe injuries to her legs in an accident that killed her mother. During her time in Sweden, she studied English by correspondence course. In 1947, the sisters jointly issued a collection of poems
Śpiew za drutami (Song Behind the Wire), which they had secretly written in the camps. These were published in New York City by a group of Polish Jewish refugees and reprinted in 2007. In 1948, Henryka emigrated to the US, to be followed by Ilona in 1949. She studied initially at
Hunter College in New York City and then at
Radcliffe College, a women's liberal arts college in
Massachusetts, which in 1999 would be fully incorporated into
Harvard University. There she was mentored by the poet
Archibald MacLeish. Within four years of arriving in the US she had been awarded a BA in English (
Phi Beta Kappa), had written the first draft of her novel
Stephania, and had won the 1950
Mademoiselle College Fiction Contest for her story,
Fru Holm. ==Writing and career==