There is a confusion about who Nancy Crumley's parents were. The will of William Crumley does not name a Nancy but the Probate Record of 1796 has a Nany listed. One redactment of his will of 1792 names a daughter Mary, but no Catherine, although online genealogies do claim that he had a daughter Catherine who married a Mooney. More research is needed.

She was James Abercrombie's first wife.

See the sources including the Crumley DNA project.
https://www.wikitree.com/wiki/Crumley-55

Children with Nancy Crumley:
*Christy Ann Abercrombie m. Alexander Crawford
*James Abercrombie m. Mary Hamilton
*Barbara Allen Abercrombie m. John Stringer
*Nancy Abercrombie m. Garland Gallant Floyd
*John Hamilton Abercrombie Senior m. Frances Carolina Cavender

Children with Mary Ann Beck:
*Elizabeth Abercrombie m. John Duncan (Cherokee Nation)
*Abia Abercrombie a daughter
*Mahala Abercrombie m. Charles George Duncan (Cherokee Nation)
*Young David Abercrombie m. Susannah Montgomery

Notes from WIKI Tree:
James Abercrombie married Mary Ann Beck about 1793 as his second wife. She was either a full blooded or half blooded Cherokee. Many write that she was an Indian princess or that her father was a chief but no record has been found to prove this. Mary Ann is found in the1798 records as releasing her dower for 100 acres in Laurens County. She had four children and several of them filed an Indian roll number. Three of her children married other Native Americans and moved to Oklahoma. James and Mary Ann were among the first settlers of Hall County, Ga. According to some early family information concerning Young David Abercrombie, Mary Ann Beck's sister was Diannah Beck (34160811). Diannah married Joseph Sitton and they also lived in Hall County Georgia. There is William Sitton (77704336), son of Joseph and Diannah mentioned in the estate of James Abercrombie who married Mary Hamilton.
She passed away in about 1820 in Hall, Georgia