[1][2] She made her senior debut in round one of the 2006 season against Ainslie in the AFL Canberra Women's competition.

O'Dea was also named part of the 2011 All-Australian women's team, and won both her club and league's best and fairest awards in 2012.

[3] Wearing number 30 and playing on the wing and half forward flank,[1] was named as part of the Victorian state teams in 2013 and 2014, and was selected to play for both the Melbourne Football Club and Western Bulldogs as part of a series of women's exhibition games.

[3][4] Prior to the start of the season, she was announced as one of two vice-captains for Melbourne, alongside Melissa Hickey.

[10] Following the conclusion of the 2020 season both O'Dea and fellow Demon Maddy Guerin were traded to the Carlton Football Club in exchange for Pick 15 in the 2020 NAB AFLW Draft.