Dunwiddie studied with Wilhelm Otto at the Academy of Arts in Berlin, with Mariano Benlliure y Gil in Madrid, and with Alberto Lagos in Buenos Aires. She lived for thirteen years in South America, traveling throughout the continent.
She executed a number of works on commissions from religious organizations. These included a bust of Cardinal Coppello, 1943, for the Cardinal's Palace in Buenos Aires; a war memorial, 1947, for the Church of the Good Shephard in Lima, Peru; a statue of St. Therese, 1948, for the Church of Sta. Maria in Cochabamba, Bolivia, a relief portrait of Pope John XXIII, 1963, for the Seminary of the Redemptorist Fathers, Suffield, Connecticut, and one of Cardinal Panico, 1965, for the hospital at Tricase, Italy. Her secular works included a bust of General Lemuel C. Shepherd, Jr., 1956, at the Marine Corps Museum, Washington, D. C., and a statue of the horse, Messenger, 1961, at Aqueduct Race Track, New York. She also created smaller sculptures of animals, a number of which she showed in annual exhibitions at the Academy.
Dunwiddie won the Academy's Speyer Prize in 1969, and the Artists Fund Prize in both 1972 and 1974. Dunwiddie was a fellow of the National Sculpture Society, and of the Royal Society of Arts, London.
