It appears from census data she died in NC between 1860-1870. His find a grave lists her death about 1866 and her parents as Hosea and Zilph (Thomas) Land. See findagrave links below.
US Census, 1870 Notla, Cherokee, NC
Citing this Record: "United States Census, 1870," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MW8D-6YG), Ausbern Beaver, North Carolina, United States; citing p. 8, family 51, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,629.
Ausbern Beaver M 58 North Carolina
Malissa Beaver F 40 North Carolina
William Beaver M 15 Georgia
Mary Beaver F 14 Georgia
Joseph Beaver M 11 Georgia
Columbus Beaver M 3 North Carolina
Emma Beaver F 0 North Carolina
Alexander Beaver M 27 Georgia
Nancy Beaver F 27 North Carolina
Margaret Beaver F 2 North Carolina
Lilly Beaver F 0 North Carolina
Caroline Beaver F 25 Georgia
William Beaver M 4 North Carolina
Samuel Beaver M 0 Tennessee
U S Census, 1860 Murphey District, Cherokee, NC
Citing this Record: "United States Census, 1860," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MDDP-3775), A J Beaver, Murphey District, Cherokee, North Carolina, United States; from "1860 U.S. Federal Census - Population," Fold3.com; citing p. 95, household ID 626, NARA microfilm publication M653, National Archives and Records Administration, Washington, D.C.; FHL microfilm 803,892.
A J Beaver M 49 Burke Co N C
Keziah Beaver F 41 Haywood Co N C
Jessee W Beaver M 23 Macon Co N C
Martha Beaver F 21 Macon Co N C
Alexander Beaver M 18 Union Co Ga
Caroline Beaver F 16 Union Co Ga
Samuel Beaver M 14 Union Co Ga
Edley Beaver M 12 Union Co Ga
William Beaver M 8 Union Co Ga
Joseph Beaver M 2 Union Co Ga
Ausborn Jefferson "Auzzie" Beaver 1st wife Keziah Land b.abt 1813 d.abt 1866 North Carolina m.abt 1830, daughter of Hosea and Zilpha Thomas Land Find A Grave Memorial# 5571474
HOSEA LAND At : http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=78808471 lists his parents etc.
Zilpha Tyrsohee Thomas Land At: http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=60943553 Their marriage record is attached to this entry. You might want to contact one of the contributors to these memorials.