Martha was born about 1835. She passed away about 1869.
Sources
The National Archives in Washington D.C.; Record Group: Records of the Bureau of the Census; Record Group Number: 29; Series Number: M432; Residence Date: 1850; Home in 1850: Somerville, Morgan, Alabama; Roll: 12; Page: 248b "United States Census, 1850", , FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MH58-M9X : Fri Oct 06 07:47:45 UTC 2023), Entry for Randolph Couch and Nancy Couch, 1850.
Texas Department of State Health Services; Austin, Texas; Texas Marriage Index, 1966-2019 "Texas Marriages, 1837-1973", , FamilySearch (https://familysearch.org/ark:/61903/1:1:V2MF-2MF : 22 January 2020), Martha A. Couch in entry for Nathan Cornell, 1867.
Find a Grave, database and images (https://www.findagrave.com/memorial/155637904/martha-a-cornell: accessed 08 November 2023), memorial page for Martha A. Couch Cornell (1835–1870), Find a Grave Memorial ID 155637904; Burial Details Unknown; Maintained by LPC333 (contributor 47532361).
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DNA Connections
It may be possible to confirm family relationships with Martha by comparing test results with other carriers of her ancestors' mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Martha: