Born in Sydney and raised in Belrose, New South Wales, Cox graduated from Roseville College in 2009.

[1][2][3][4] Her brother, Tim Cox, played baseball professionally for the Boston Red Sox's farm system.

[3] She played several sports while in secondary school, including touch football, netball and athletics.

[8] She started playing elite level softball in 2003 with a club in Manly Warringah where she was coached by Angela Knight.

[7] That month, she was one of several women nominated for Western Athletic Conference (WAC) Hitter of the Week.

[4] As a sophomore in 2013, Cox again had the top batting average (.363) for San Jose State, in addition to a team-leading 66 hits and 20 stolen bases.

[13] As en eighteen-year-old, Cox made her national team debut in April 2009 at the International Southern Challenge in New Zealand,[9] after getting her first call up in March.

[14] Cox was selected for the Australian women's national softball team at the 2020 Summer Olympics.