[1] Breen represented Republic of Ireland under-17s in the football event at the 2003 European Youth Summer Olympic Festival.
[2] She played for the Republic of Ireland under-19s from 2004 to 2005,[1] and was in the squad for UEFA European Under-19 Championship qualifying matches.
[5] In 2015, she played for Wexford Youths in the UEFA Women's Champions League; she scored four goals in a qualifying group stage match against Cardiff Met.
[9] In January 2016, Breen was not selected in the Ireland squad for matches against the United States, as she was preparing to emigrate to Australia.
[4] Breen played for UTS Shamrocks, and in 2016, she won the AFL Sydney Women's Division One Best and Fairest award.