Pellissard was 15 years old when she won her first national title and the following year she became 10-metre platform European Champion. Her first appearance at the Olympics happened at the 1948 Summer Olympics, when she was 17 years old, and she finished in fourth place in the 3-metre springboard less than a full point behind Patsy Elsener who won the bronze medal. She also finished 6th in the 10-metre platform.