[2] Fellow Olympic swimmer Jackie LaVine, who also trained with the Chicago Town Club, served as her mentor.

[1] She received a bronze medal as a member of the third-place U.S. team in the women's 4×100-meter freestyle relay, together with teammates Jackie LaVine, Marilee Stepan and Evelyn Kawamoto.

[1][3] Individually, she also competed in the women's 100-meter freestyle and finished fifth in the event final with a time of 1:07.1, only three tenths of a second behind the winner, Hungarian Katalin Szőke.

[1][4] According to the official event clock time of 1:07.1, Alderson finished in a third-place tie with Judit Temes of Hungary and Joan Harrison of South Africa, but the judges awarded her fifth place.

[7] She continued to swim competitively while attending college, set a world record in the 100-yard freestyle event in 1954, and was a member of Amateur Athletic Union (AAU) national championship relay teams in 1952 and 1953.