Mom has a death certificate for Minnie Chamblin Kinsel listing Samuel and Mercy Ann Winsor as her parents, but who are Mercy Ann's parents?
I found a death record for a Mercy Chamberlin in KC, Missouri -- is this our Mercy Ann? Went online to see if I could locate where she was living; place of death listed as 12th and Hartesty. Google Aerial map showed a big cemetery only a block away... I checked it out, and found it is a very old cemetery. So, here is another possibility. Perhaps Mercy Ann was buried there. Worth looking into.
That didn't take long -- they have a list of surnames online. No Chamblin or Chamberlin, Samuel or Mercy. But worth checking other cemeteries!