 In 1913 Wittkowski returned to the Covent Garden Theatre to play the alternate lead in the Raymond Rôze opera "Joan of Arc" and the Wagnerian roles Isolde and Ortrude.During her time with the Cincinnati Zoo Opera, Wittkowski opened a studio in 1930 at the Hotel Biltmore in Troy, Ohio, teaching voice culture, opera and opera chorus, and a few years later formed with her husband the Columbus Civic Opera Company at Columbus, Ohio.In 1917, she married Arlington Humphrey Mallery (1877–1968), a civil engineer, a veteran of the Spanish–American War, a one-time Democratic Party candidate for the United States Congress, and president of the Syracuse Bridge Company.