Unknown

when i looked at an enlarged version of the pic, it looked to me like maybe (and i could be wrong) that the lady may have had some native american in her genetics...and as far as the age of the pic, i'd place it sometime around the 1880's...just judging by the clothes she's wearing, and the picture itself....
i don't know who she might be other than that...and like i said i could be wrong about the native american angle, but the eyes sort of make me think of the characteristic eyes you see in old photos of the native americans....
hope what guesses i've made help something...