In 1903, she became part owner of the Villa Trianon near Versailles, France, along with decorator and socialite Elsie De Wolfe and theatrical/literary agent Elisabeth Marbury. Morgan was instrumental in assisting De Wolfe, her close friend, in pioneering a career in interior decoration. The three women, known as "The Versailles Triumvirate", hosted a salon in France and, in 1903, along with Florence Jaffray Harriman, helped organize the Colony Club, the first women's social club in New York City and, later, helped found the exclusive neighborhood of Sutton Place along Manhattan's East River.