In January 2006, Plunkett was appointed Australian Ambassador to Ireland, with concurrent accreditation to the Holy See. Her Holy See appointment was formalised by Pope Benedict XVI on 18 May 2006 when he accepted her letters of credence.
On January 2006, Plunkett became the Australian Ambassador to Ireland, concurrently accredited to the Holy See. Her accreditation to the Holy See was confirmed by Pope Benedict XVI on May 18, 2006 upon acceptance of her letters of credence.