She continued her singing career for a further 16 years, retiring from performing in 1994. In 1985, she remarried, to Dr Pádraig O'Toole, who was instrumental in the development of her career from 1974. They spent six years in Tanzania where her husband taught at the Tanzania School of Journalism, at the University of Dar es Salaam. A musical play about her life, "Harp on the Willow" by John Misto, was a great success in Australia in early 2007. Mary O'Hara completed five volumes of her harp accompaniments, and still travels, giving talks at locales such as the Yeats International Summer School, Sligo (2007), the O'Carolan Festival, Keadue, County Roscommon (2008), Northern Lights Harp Festival, Ottawa (2009), New York University (2009), and Boston College (2009). The Burns Library at Boston College houses her papers, and held a "Mary O'Hara" exhibition ending 30 April 2010.