Martha Allen Blackerby Beach

I am desperately seeking information on Martha Jane "Mattie" Allen, born 28 June 1841 in Kentucky to John Allen and Margaret Barbara Grimes.She married first (very young) on 4 Nov 1855 in Davis Co., Iowa to James Blackerby.He died on 2 Dec 1904 in Joplin, Jasper Co., Missouri.Martha married Thomas Beach or Beech on 30 September 1908 in Jasper Co., Missouri.He was of Oswego, Kansas.
While they were married in Jasper Co., the license was issued in Newton Co., Missouri.

On the 1910 Us Census they were living in the first Ward of Oswego, Labette Co., Kansas (Martha had lived in that county previous to their marriage).Thomas died before September 1916.On the 1920 US Census Martha Beach is shown as a boarder in the household of divorced Henry Hevel (age 52) in Mound Valley, Labette Co., Kansas.When her sister, Amanda Allen Ellis, died in 1922, Martha was living in Joplin, Jasper Co., Missouri (obituary).After that I have lost her.

I have checked Missouri death records, cemetery records of Labette Co., KS and Joplin co., Missouri and cannot find either Martha or her husband, Thomas.If anybody knows about these people, it would be great to communicate.Thanks.