This photo does not provide many clues other than the name, but I believe the Sadie M. Kopf here is Sadie Marie Kopf of Kansas, born 1904. She married Roy Dennis Self, with whom she had five children. In this photo, Sadie is wearing an unusually long knit cap- I've never seen one like it before!
If you know who this may be, let us know in the comments!
You may also have noticed the new "donate" button at the top of the page- there's no pressure to donate! This is simply so that I might have an easier time buying photographs this year and so that I can post more regularly. Even just a couple dollars is helpful! :)