When Duke came of age, she used her wealth to pursue a variety of interests, including extensive world travel and the arts. She studied singing with Estelle Liebling, the voice teacher of Beverly Sills, in New York City. During World War II, she worked in a canteen for sailors in Egypt, taking a salary of one dollar a year. She spoke French fluently. In 1945, Duke began a short-lived career as a foreign correspondent for the International News Service, reporting from different cities across the war-ravaged Europe. After the war, she moved to Paris and wrote for the magazine Harper's Bazaar.
