Missouri death certificate:http://www.sos.mo.gov/archives/resources/deathcertificates/
There is a death certificate for Mary E. Lady. (You may already have this info).
born: Jan 16, 1867 Ray Co. Mo
died: March 29, 1940 Barry Co. Mo
Father: James Petree
Mother: Sarah Fowler
Spouse: Solomon Lady
Informant: Jodie Rowley
Find a Grave, headstone picture. Mary Elizabeth Petree Ladyhttp://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=la...
I found a Mary Elizabeth Petree that was married to a Nepoleon B. Rowley. His headstone has his wife: Mary Elizabeth Rowley, with the same birth & death dates as Mary Elizabeth Petree Lady, both Lady & Rowley headstones are in Boucher Cemetery.http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=ro...
Marriage record.. (Ptree must be a typo).https://familysearch.org/pal:/MM9.1.1/V289-8T6
Napolian B. Rowley
Spouse's Name: Bettie Ptree
Event Date: 28 Dec 1884
Event Place: Barry,Missouri
Event Place: Pierce City, Lawrence, Missouri
Head: Soloman Lady M 64 Kentucky
Wife Mary E Lady F 63 Missouri
You might want to look for that marriage info under the name Petree & Rowley