Caldwell begun running at five years old, and steadily improved as a junior, coached by Gavin Burren since age 13.
2022 In 2022, aged 20, Caldwell won the Australian national title in the
1500 metres ahead of Olympic finalist
Linden Hall. In July 2023, she ran an 800 metres personal best of 1:58.48 at the
Silesia Diamond league lin
Chorzów. Selected for the 1500 m at the
2023 World Athletics Championships, she qualified for the semi-finals, breaking four minutes for the first time in her career with a time of 3:59.79.
2024 In April 2024, she won silver at the
Australian Athletics Championships in the 800 metres race. She competed in the 800 metres at the
2024 Summer Olympics in Paris in August 2024, where she reached the semi-finals.
2025 She was selected for the 800 metres at the
2025 World Athletics Indoor Championships in
Nanjing in March 2025. She won the 800 metres title at the
Australian Athletics Championships on 13 April 2025 in Perth in a time of 2:00.51, finishing ahead of
Claudia Hollingsworth. At the
Diamond League opener in
Xiamen, Caldwell lowered ran a new
Oceanic record in the 100 m to 2:32.94, finishing second behind
Faith Kipyegon. In May 2025, she was named as a challenger for the short distance category at the
2025 Grand Slam Track event in Philadelphia. On 6 June 2025, she finished third over 1500 metres at the
2025 Golden Gala in Rome, part of the
2025 Diamond League, running 3:59.32. She set a new personal best at the
2025 Kamila Skolimowska Memorial, in Poland, with a run of 1:57.70 for the 800 metres. She was a semi-finalist in the
women's 800 metres at the
2025 World Athletics Championships in
Tokyo, Japan.
2026 Caldwell ran a meeting record 4:02.62 to win the 1500 metres at the
Perth Track Classic on 14 February 2026, finishing ahead of
Nozomi Tanaka. On 12 April, she defeated Hollingsworth to retain her Australian national title over 800 metres, running 1:58.57.
Circuit performances == Personal life ==