At her first Olympics, Roffey qualified for two swimming events with three days in between. She posted FINA B-standard entry times of 9:01.41 (800 m freestyle) and 2:17.70 (200 m butterfly) from the Ultra Swim Meet in Charlotte, North Carolina.[3][4][5] In the 200 m butterfly, Roffey challenged seven other swimmers on the first heat, including 15-year-old Maria Bulakhova of Russia. She cleared a 2:20 barrier to clinch a fifth spot and thirtieth overall in 2:19.34, just nearly two seconds off her entry time.[6][7] In her second event, 800 m freestyle, Kwon placed twenty-fifth overall on the morning's preliminaries. Swimming again in heat one, she raced to fourth place by a 3.07-second margin behind winner Golda Marcus of El Salvador with a time of 9:02.88.[8][9]