Despite the prison staff being French and visits from a chaplain, Guyot fell ill in prison and did not receive proper treatment. When her brother George arrived to pick her up at the end of her sentence in January 1941, he learned that she had just been hospitalised as an emergency. He discovered her in a skeletal state in the hospital, with gangrenous frostbitten hands. George rushed her to Paris where a surgeon saved her hand, but the disease progressed and she died in great pain at the Broussais Hospital on 22 August 1941.
