Unknown woman, Tintype 002

A photo of an unknown woman - this was marked "John Hargis's Grandmother", only he had two, like everyone else, so WHICH ONE? I think this may have been Nancy Yoakum Mackey, due to the fact that I have photos of Mary ette Mackey Hargis, and her sister, who, in my opinion show a family resemblance as daughters. However, if I am incorrect then this is a photo of Eliza Jane Beckham Hargis.

anyone have an idea about which grandmother she was, I would love some input. Thankyou.