At the age of 15, Deardurff represented the United States at the 1972 Summer Olympics in Munich, Germany. She won a gold medal as a member of the first-place U.S. team in the women's 4×100-meter medley relay, swimming the butterfly leg of the relay. Deardurff and her relay teammates Melissa Belote, Cathy Carr and Sandy Neilson set a new world record of 4:20.75 in the event final. Individually, she also competed in the women's 100-meter butterfly, finishing fourth in the event final with a time of 1:03.95. She also received a silver medal in the women's 4×100-meter medley relay at the 1973 World Aquatics Championships in Belgrade, Yugoslavia.