At the age of 15, Caulkins won five gold medals and a silver medal at the 1978 World Championships in West Berlin. She won the 200-meter individual medley, the 400-meter individual medley, and the 200-meter butterfly, and was a member of the winning U.S. teams in the 4×100-meter medley relay, and the 4×100-meter freestyle relay. In the process, she set four world records and one American record. Largely as a result of her performance in Berlin, Caulkins won the 1978 James E. Sullivan Award, given by the Amateur Athletic Union in recognition of the most outstanding American amateur athlete of the year. At 15 years old, she was the youngest-ever recipient of the Sullivan Award.