Because Abba is such an unusual name, I looked through Hinshaw for that name, and found her, first, in the Contentnea MM, WAyne NC...later called theNahunta MM. Abba Cox 4-24-1787 father Joshua Cox and other Judith Peele...their children; Anna b 1777; Charity 1779; John 1791; Phebe 1785; Abba 1787; Edmond 1791; Betty 1795. Then, in the Piney Grove mm records; 1804-4-26 Abba d, Josiah and Judith Cox m Charles Marine.
from the Rich Square MM records; 1777-4-19 Josiah s Thomas Dobbs Co, m Judith Peelee
1777 Judith w Josiah rqct Contentng mm
Robert Peele b 8-29-1709 d 7-13-1782 m Elizabeth. children; Robert 1730; Passco 1733; Elizabeth 1735;Mary 1742; David 1751; Judith 1754; Jeremiah 1756; Anna 1757; Charity 1759; Abba 1761; Betsy 1762 If you visit the LDS site and use Joshah Cox as your search name, you'll find about 5 earlier generations for his family....they would be good clues to follow up on....