In December 2011 Hallinan played the role of Justine in Lucinda Coxon's play "Herding Cats" at the Hampstead Theatre, London, a role she previously played at the Ustinov Studio, Bath in December 2010.
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In 2011 Hallinan starred in Precious Little Talent written by Ella Hickson and directed by James Dacre at Trafalgar Studios theatre in London's West End.
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