	As a 15-year-old, she won three gold medals and one silver at the 1964 Summer Olympics in Tokyo, Japan. She won the women's 100-meter butterfly, and was a member of the winning U.S. teams in the women's 4×100-meter freestyle relay and the women's 4×100-meter medley relay. She also took second place in the women's 100-meter freestyle, finishing behind Australian Dawn Fraser, for a total of four medals.