Career
O'Mahony was previously the party's candidate in Chilliwack-Hope in the 2009 provincial election, as well as running federally for the New Democrats in Chilliwack—Fraser Canyon in the 2011 federal election. She became the first New Democrat ever to represent the area. In the 2013 provincial election, O'Mahony was defeated by BC Liberal Party candidate Laurie Throness, the same Liberal candidate she had faced in the 2012 by-election.