McCracken’s father is Captain John McCracken, a Presbyterian of Scottish descent and a prominent shipowner. Her mother, Ann Joy, comes from a French Protestant Huguenot family, which made its money in the linen trade and founded the Belfast News Letter. Her liberal and far-sighted parents send her to David Manson‘s progressive co-educational school, where ‘young ladies’ received the same education as the boys. She excels at mathematics.
As an adult, McCracken manages a successful muslin business in Belfast, which pioneers the production of patterned and checked muslin. She runs the business together with her sister, and has at least one agent in Dublin.
McCracken is the sister of Henry Joy McCracken, one of the founding members of the Society of United Irishmen. In the aftermath of her brother’s defeat at the Battle of Antrim on June 7, 1798 she helps Henry Joy and some colleagues hide in the hills of south Antrim, bringing them clothes and money. She is arranging for a ship to take him to the United States when he is recognised by three Carrickfergus soldiers and arrested there on July 7, 1798.
McCracken shares her brother’s interest in reviving the oral-music tradition of Ireland, and is a founding member of the Belfast Harp Society (1808–1813). She supports Edward Bunting in his collecting of traditional music, introducing him to people who can help, acting as his unofficial secretary and contributes anonymously to the second volume of his work The Ancient Music of Ireland in 1809. Bunting lives with the McCrackens for thirty-five years, before moving to Dublin 1819 and thereafter corresponds regularly with McCracken.
McCracken, like her brother, holds radical beliefs and these extend not just to the politics of the time, but to many social issues, such as poverty and slavery. She is dedicated to the poor of Belfast and from her earliest childhood she works to raise funds and provide clothes for the children of the Belfast Poorhouse, now known as Clifton House, Belfast. Following a visit from Elizabeth Fry she forms the Ladies Committee of the Belfast Charitable Society and is chair from 1832–1855. Thanks to the efforts of the committee a school, and later a nursery, is set up to educate the orphans of Belfast. She takes particular pains to find a suitable teacher, displaying a high level of dedication and compassion for her cause. The committee also inspects the homes where children of the poorhouse are apprenticed out.
McCracken leads the Women’s Abolitionary Ccmmittee in Belfast during the height of the anti-slavery movement and continues to promote the cause long after the spirit of radicalism had died in Belfast. By the 1850s, the liberality of the 1790s had largely evaporated in the aftermath of the failure of the Irish Rebellion of 1798, and the subsequent executions or exile of the leading protagonists.
At the age of 88, McCracken is to be seen at the Belfast docks, handing out anti-slavery leaflets to those boarding ships bound for the United States, where slavery is still practised. Her continued campaign long after the deaths of her counterparts serves to demonstrate the strength of radicalism that exists in certain circles of Belfast society at the close of the eighteenth century.
After her brother’s execution in Belfast, McCracken takes over the care of his illegitimate daughter, Maria, which is not universally accepted in her wider family. She lives with Maria and her family until her death at the age of 96 on July 26, 1866. She is buried in grave number 35 at Clifton Street Cemetery.
A blue plaque has been placed by the Ulster History Circle on the house at 62 Donegall Pass, Belfast, where McCracken lived for much of her later life.