I know you have been searching way longer than I have and may have already looked in to this, but I noticed in the 1880 census (when she would have been about 10 years old), she and her family lived in the Buffalo Creek area. I googled to see if there might have been any family cemeteries near the Buffalo Creek area in Johnson City/Carter County, and the first result that came up was Linville Cemetery on Paddle Creek Road. Her name isn't listed as one of the ones being buried there, but not all the graves have been accounted for. Looking at the birth dates and death dates of the other graves that have been listed for that cemetery, it would fall around the same estimated time of her death. From the one picture I was able to see posted of the cemetery, it looks like it is in a more wooded residential area, but it may be worth a shot to check and see, or to maybe see if any of the locals might have some information that has been passed down. If I can ever get off work while it is still daylight, I would love to check it out and see. It's total speculation and may be a complete dead-end, but might be worth a shot if you haven't already checked into it. It's driving me nuts not being able to find anything, but I'll let you know if I do.
