I believe I'm working on this set of Murphys as well. My great-great grandmother was Sallie Bett Murphy, who married John Bateman. She is buried at this family cemetery you mentioned. Although, there are VERY few stones with markings. Most are unidentified, and there's no one alive who knows who the graves belong to.
If these are the same family, then my Sallie Bett was born on June 22, 1859. I believe she had a brother Joseph who married the sister of her husband.
Do you know anything about Cherokee bloodlines in this family? My great-grandfather was part Cherokee, and I believe it came through the Murphy side.
I've only just begun to research this side of the family, and have been having a hard time so far. I'd appreciate any information you could give me.