I think Rosa (Rosie) Draper Cooper was my great-great-grandmother's sister. Until I found your tree, I assumed Rosa died in childhood, since I couldn't find her in the 1880 census. My 2nd great grandmother's name was Sallie Draper Hill. The dates and locations match and, according to Rosa's death certificate, in both cases their father is named Frank Draper. Also, Rosa has a daughter named Sallie, and my 2nd great grandmother has a daughter named Rosie. This is probably not a coincidence. If you're interested I have more information - some of it based on guesswork - located in my tree.