A convert to Catholicism, Béatrice felt safe in Paris after the Nazi occupation. Divorced from her Jewish husband Léon Reinach, she believed that her wealth and the influential people she rode horses with in the Parc Monceau would shield her from being taken. In the Musée Nissim de Camondo, on the top floor, there is a letter from her ex-husband telling Béatrice to leave Paris with their son and daughter. However, she disregarded his advice.[2]
In 1943, under the German occupation of France during World War II, Béatrice, her ex-husband and their two children were forcibly removed from Paris and taken to the Drancy deportation camp north of the city. From there, they were subsequently deported to Auschwitz concentration camp, where they all were murdered.[3][4][5]
Her Aunt, Elisabeth Cahen d'Anvers (1874–1944), who had also divorced and converted to Catholicism was also imprisoned at Drancy deportation camp and died at KZ Auschwitz.