Looking for Susannah Dial

I’m searching for any information on Cherokee parentage of my great-great-great grandmother Susannah Dial Ashley, born in Virginia about 1822, lived in Greene County, Tennessee most of her life, but listed herself as white in census records, She was at least half Cherokee or more, a housemaid to Henry Feezell and his wife, had a son by Henry’s married son, Samuel Feezel. The boy’s name was Bayles Feezell, my great-great grandfather. I cannot find any information on Susannah’s parents, my g-g-g-g grandparents.