During World War II Gray, along with all other foreigners, was forced to evacuate the coast of France and move inland. After the war she had discovered that her flat in Saint-Tropez had been blown up and that E1027 had been looted.
Gray returned to Paris and led a reclusive life. She continued to work on new projects, but was almost forgotten by the design industry. When she was around seventy, she started to lose her sight and hearing, yet when she was eighty, she transformed a dilapidated agricultural shed outside Saint-Tropez into a summer home; she soon moved there and continued to work. Shortly before her death, Gray’s work was shown in an exhibition in London. At the age of ninety-eight, Gray died in her apartment on rue Bonaparte in Paris.