Mullins was head girl at Mount Temple Comprehensive School in Dublin. She read Drama & Theatre Studies at Trinity College Dublin before transferring and finishing with a first class degree in English Literature at the University of St Andrews, Scotland in 2006. She trained as an actor at the Bristol Old Vic Theatre School from 2006 - 2008 and now lives in London.
Mullins was continuity announcer for ITV3 from Dec 2012 - Dec 2013 and is represented by Sue Terry Voices. Her most recent audio drama work includes playing Mina opposite Mark Gatiss in Dracula by Big Finish Productions.
