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Two dates are cited for her deportation/arrival at Auschwitz. As those dates are only one day apart, we can infer that Felicja was deported in August of 1944 on either the 16th or 17th to Auschwitz. After Auschwitz, Karo was transferred to both Bad-Kudova and Graeban, as cited in her biography, only to end in Bergen-Belsen.
Subsequently, according to USHMM Holocaust Encyclopedia, Felicja Karo was liberated by British troops from Bergen-Belsen on April 15, 1945.