This photo is captioned "Grandma" and is from one of Elvis John Brassfield's photo albums. It appears to be Nellie Belle (Bates) Brassfield around the 1910s, she was born in 1873, if you would like to estimate a date based on her appearance. She was Elvis's grandmother, the mother of his father Floyd Gipson Brassfield. Following her husband's death, she remarried and took the last name of her husband, Ben Evers.
See this post for more details about Nellie.