McMahon was recruited by Geelong as a cross-code rookie prior to the club's inaugural season in the AFLW, having previously played basketball with the Australian Institute of Sport in the Women's National Basketball League (WNBL), and also the Geelong Supercats.

[1] McMahon also played netball in local leagues prior to joining Geelong's VFL Women's football team in 2018, and has three children.

[1] McMahon made her AFLW debut during the first round of the 2019 season, against Collingwood at GMHBA Stadium.

[2] In March 2023, McMahon retired, after four seasons playing and one spent on the inactive list.

[4] This Australian rules football biography of a person born in the 1980s is a stub.