Hollingsworth was selected for the Australian team to compete in the 2021 World U20 Championships, but ultimately the team didn't travel to Nairobi for the Championships due to the
COVID-19 pandemic. She was competing with Olympic standard athletes before she was sixteen years old. In March 2021, Hollingsworth aged 15 ran the fastest-ever time worldwide for an U18 athlete in the
1000 metres. Hollingsworth won the
2022 Oceania Athletics Championships in the
1500 metres and was runner up in the
800 metres. She was chosen to compete for Australia at the
2022 World Athletics Championships. Due to her young age Hollingsworth could only choose one distance race to compete in, and chose the 800 metres. She also competed at the
2022 World Athletics U20 Championships in
Cali, Colombia. In
Canberra in March 2024, Hollingsworth ran her third consecutive Australian and area under-20 record of 1:58.81 for the 800 metres. In
Adelaide in April 2024, she ran 1:58.40 to win the
Australian Athletics Championships 800 metres race, and set a new national under-20 record. She competed in the 800 metres at the
2024 Summer Olympics in Paris in August 2024, reaching the semi-finals. Hollingsworth won the silver medal in the 800 metres at the
2024 World Athletics U20 Championships in
Lima, Peru in August 2024. In March 2025, Hollingsworth ran a meeting record 4:05.98 for the 1500 metres to win at the
Maurie Plant Meet in Melbourne. She set a new area record at the
2025 Kamila Skolimowska Memorial, in Poland, part of the
2025 Diamond League, with a run of 1:57.67 for the 800 metres. She was a semi-finalist in the
women's 800 metres at the
2025 World Athletics Championships in
Tokyo, Japan. In February 2026, Hollingsworth ran 8:37.42 to become Australian champion over
3000 metres at the Hobart Track Classic. Competing at the 2026 Maurie Plant Meet in Melbourne she won the 1500 metres in 4:01.30, ahead of Great Britain's world indoor champion
Georgia Hunter Bell. On 10 April 2026, she was first across the line in the 1500 metres at the Australian Championships but was initially disqualified for a racing incident that saw
Jessica Hull fall on the home straight, before later being reinstated on appeal. On 12 April, she was runner-up to defending champion
Abbey Caldwell over 800 metres at the championships. ==Personal life==