Ada Lee Davis IN Tate Desoto County MS

Looking for the ancestors of my great-grandmother, Ada Lee Davis. She was born Oct. 1881 in Tate County,MS. Her father was William C. Davis b. abt 5/1849 in TN and mother was Anna ?, b. abt 3/1865 in TN. She had 3 brothers: Paul b. 7/1893, Lewis b. 8/1909, Jessie Coleman b. 7/1884 and 1 sister, Ina b. 2/1888.
I have been searching for several years for her grandparents, etc but have not had any luck.
Would appreciate any information.