UCC O'Flynn was a member of the
University College Cork teams that won the intervarsity tournament, the Chilean Cup, in 2006 and 2007. O'Flynn was captain of the UCC team during the 2009–10 season. O'Flynn was a UCC player when she made her senior debut for
Ireland.
Hermes Between 2010 and 2014 O'Flynn played for
Hermes in the
Women's Irish Hockey League. In 2010–11 she was a member of the Hermes team that played in the
Irish Senior Cup final, losing 3–1 to
Pegasus. O'Flynn also played and scored twice for Hermes in the 2012 Women's EuroHockey Club Champion's Challenge I final, defeating Lille Metropole 3–1.
Ireland international Between 2010 and 2014 O'Flynn made 120 appearances and scored 30 goals for
Ireland. O'Flynn played at Ireland A level before she made her senior debut for Ireland against
Belgium in February 2010. At the
2012 Women's Field Hockey Olympic Qualifier, O'Flynn was a prominent member of the Ireland team that finished as runners up to Belgium. Despite breaking her jaw during a game against
Spain, O'Flynn finished the tournament as topscorer, after scoring eight goals in five matches, all from
penalty corners. Following her performance in this tournament, O'Flynn was subsequently named
The Irish Times/
Irish Sports Council Sportswoman of the Month for March 2012. She was also voted the Ireland Women's Player's Player of the Year for 2012. O'Flynn made her 100th appearance for Ireland during a series of games against Spain in January 2014. In August 2014, during a game against
France, O'Flynn scored a quartet of goals from penalty corners. ==Rugby sevens==