[2] Hall made her international debut at the 1967 Pan American Games in Winnipeg, where she won a silver medal in the 100-meter backstroke behind Canadian gold medalist Elaine Tanner.

During this time there were no Title IX, high school, or college swimming teams for women.

Swimming the lead-off backstroke leg of the relay, she set a new Olympic record of 4:28.3 with American teammates Catie Ball (breaststroke), Ellie Daniel (butterfly), and Susan Pedersen (freestyle).

At the 1970 World University Games in Turin, Italy, she won three golds in the 100-meter backstroke and the 4×100-meter freestyle and 4×100-meter medley relays.

In 1967, Hall became the first woman to break the one minute mark in the 100-yard backstroke, a significant milestone for a difficult stroke.