She began competing in athletics for Werrington Athletics Club in
Sydney. She became New South Wales state champion at 16 years—old. As an 18-year-old, Owusu recorded Australia’s fourth longest women’s triple jump at the 2019 under-20 Oceania Championships where she jumped 13.42 metres. She is coached by Australian triple jumper
Andrew Murphy. She won her first national title at the
2023 Australian Athletics Championships in Brisbane and went on to represent Australia at the delayed
2021 Summer World University Games in
Chengdu, China, placing sixth overall. That year, she retained her national title at the 2024 Australian Athletics Championships in
Adelaide. She won the Australian Athletics Championships for a third time in April 2025 in
Perth. She was selected for the
2025 Summer World University Games in Germany, winning the bronze medal in the women's triple jump with a personal best jump of 13.86 metres (+0.9), she had also previously broken her personal best earlier in the competition. In September 2025, she competed at the
2025 World Championships in
Tokyo, Japan, without advancing to the final. She was the first Australian woman to compete in the triple jump at the event. On 10 April 2026, she won her fourth straight triple jump title at the Australian Championships in Sydney, with a leap of 13.58m (+0.4) to finish ahead of
Tiana Boras.{{cite web|title= KENNEDY AND MYERS SHINE UNDER FRIDAY NIGHT LIGHTS AT AUSTRALIAN ATHLETICS CHAMPIONSHIPS|website=Athletics.com.au|url= https://www.athletics.com.au/news/kennedy-and-myers-shine-under-friday-night-lights-at-australian-athletics-championships/ ==Personal life==