If your ancestor was given land or such by her owner, there should be some kind of deed record, be it land or maybe a will of the slaveowner. If you know the owner's name, you may be able to find a will for him or possibly estate records. Many times the will may have the information in it about giving land to a former slave. That's how I found my ancestors' records when I stumbled across their names in a list of slaves in their former owners will. I was lucky in that mine was a family unit of eight that was freed at one time, most of whom I already knew the names of, so seeing them named together made it easy to recognize them as mine. Up until that time, I hadn't even known their owners, only that they had first appeared in the census around 1800. So it pays to check back as far as you can to find the first time your family shows up, then to start looking at the wills for around that time in the county.

Anson is not one of the counties in the book, unfortunately either. Here is a list of the Counties that are covered:
Bertie, Buncombe, Caswell, Chatham, Chowan, Craven, Cumberland, Duplin, Edgecombe, Franklin, Gates, Granville, Guilford, Halifax, Lincoln, New Hanover, Orange, Pasquotank, Perquimans, Randolph, Rockingham, Stokes, Surry, Wake, Warren, Wayne, and Wilkes. Also, the author didn't cover all of the emancipation records, just what was found in the NC State Archives under "Slaves and Free Negroes" and "Slaves an Free Persons of Color", so as you can see, there apparently were a lot of records not available to the author.