Vorathamrong made her first Thai team at the 2000 Summer Olympics in Sydney.

[5][6] At the 2004 Summer Olympics in Athens, Vorathamrong maintained her program, competing again in the 100 and 200 m backstroke.

[5][7][8] In the 100 m backstroke, Vorathamrong challenged six other swimmers in heat two, including 14-year-olds Anastassiya Prilepa of Kazakhstan and Olga Gnedovskaya of Uzbekistan.

She posted a lifetime best of 1:05.15 to take a second spot and thirty-second overall by 0.23 of a second ahead of Turkey's Derya Erke.

Swimming in the same heat as her first, she raced to seventh place by a 7.04-second margin behind winner Evelyn Verrasztó of Hungary, in a time of 2:21.11.