[5] Aldersley was first selected to represent South Australia at age seventeen in the women's youth eight in 2009 contesting the Bicentennial Cup at the Interstate Regatta within the Australian Rowing Championships.

In 2010 she also rowed in the South Australian senior women's eight competing for the Queen's Cup at the Interstate Regatta.

[8] Aldersey competed as South Australia's single scull representative racing for the Nell Slater Trophy in the Interstate Regatta in 2013, 2017, 2018 and 2019.

[12][3] In July 2011 Aldersey competed at the World Rowing U23 Championships in Amsterdam and placed fourth in the final of the women's coxless pair.

Aldersey was a member of the Australian women's eight who initially missed qualification for the 2016 Rio Olympics but received a late call up following the Russian drug scandal.

The crew had dispersed two months earlier after their failure to qualify but reconvened, travelled at the last minute to Rio and borrowed a shell.

[16] Aldersey, Werry, Hawe and Stephan were selected to race Australia's coxless four at the 2019 World Rowing Championships in Linz, Austria.

Olympia moved into the Australian women's eight who placed third in their heat, fourth in the repechage and fifth in the Olympic final.

[16] Had they managed to maintain their time of 5:57:15 that they achieved in their repechage they would have beaten the winners, Canada, by nearly two seconds and won the gold medal.

[16] For the 2023 World Rowing Championships in Belgrade Serbia, the Australian women's eight was unchanged overall although Aldersey moved into the three seat.