The dramatic announcement came after her lacklustre performance in the Women’s 100m Butterfly heats, which saw her come sixth and finish with a time of 1:03.09.
She failed to qualify for the semi-finals after swimming more than three seconds slower than her personal best.
Following this, the 20-year-old then abruptly announced she was retiring from the sport on social media, telling her 500,000 Instagram followers: “Swimming: thank you for allowing me to dream, you taught me to fight, to try, perseverance, sacrifice, discipline and many more.