[3] In 2011, Greenwood acquired a brain injury as a result of two strokes caused by acute appendicitis and septic shock.

In 2014, she decided to apply for classification to take part in para-swimming after joining the Bay & Basin Swim Club in Shoalhaven, New South Wales.

[7] At the 2020 Tokyo Paralympics, Greenwood won the silver medal in the women's 100 m butterfly S10 with a time of 1:07.89, just 0.37 of a second behind the winner, Mikaela Jenkins of the United States.

At the 2022 Commonwealth Games in Birmingham, Greenwood won the gold medal in the women's 200 m individual medley SM10.

[10][11] At the 2023 World Para Swimming Championships, Manchester, England, she won the bronze medal in the Women's 100 m butterfly S10.