The Tyler County Texas Cemeteries lists this resting place as "Mrs. Hill". It is located in the Kirkland cemetery which has the burial for Jason and Martha Hill Kirkland. Mrs. Nancy Hill, Martha's mother was living with her during the 1880 census. Based on this information I believe this is Nancy Hill's headstone.
For genealogy information, please visit werelate.org - Nancy A. Hill´¯`·.¸¸.ƸӜƷ