Mullin was part of the Mayo GAA side that lost the 2001 All-Ireland Senior Ladies' Football Championship Final, and won the league in 2002.
[7] She competed in the football event at the 2007 Summer Universiade, and so was unavailable to play for the Mayo Ladies team in the 2007–08 UEFA Women's Cup.
[8] She scored in the 2013 FAI Women's Cup Final; Castlebar Celtic lost the match 3–2 to Raheny United.
[10] A persistent ankle injury forced Mullin's retirement from playing after the 2013–14 season.
[6] In 2012, Mullin made her first appearance for the Republic of Ireland women's national football team in an Algarve Cup match against Hungary.