The Kronsteins still planned to emigrate, but, in June 1941, Ili's application for a U.S. visa got denied. In the past, she was confined in Gurs internment camp for six weeks alongside ten thousand refugees, both Jews and anti-Fascists. Also in Gurs was Charlotte Salomon and Hannah Arendt. In Gurs, Kronstein showed "remarkable courage, good humor and resourcefulness," despite dwindling health. In late 1940, Kronstein endured paralysis of her right arm. Later on in 1945, Kronstein was diagnosed with multiple sclerosis. Over the course of the year 1941, she could not work for extended amounts of time, however, she still drew until she could no longer grip a pencil. Following Ray-Rapaport's immigration to the U.S. in 1942, Kronstein went to Liechtenstein and later to Switzerland in order to receive treatment for her illnesses. She was paralyzed yet mentally attentive and spent her last four years of life in private care in Zürich. She died at the age of fifty-one on April 22, 1948.