Her name was Cynthia Ann Parker (ca. 1825-ca. 1871) and in this photo she was nursing her daughter, Prairie Flower (Toposannah). Parker was captured by Native American Comanches as a teenager, later married Chief Peta Nocona and bore children including Quanah Parker, the last Comanche Chief.1860-1870.
Parker’s life is very interesting. If you’d like to learn more about her, click here.