Martha is not listed on the 1850 Census with the rest of her family. I'm going to assume that she must have passed away before then.[1]
Sources
↑ "United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHVM-WZ2 : accessed 19 September 2015), Matilda R Hilsabeck in household of William Hilsabeck, Jefferson, Owen, Indiana, United States; citing family 547, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
See also:
Lovell, Rosemary (Faulk). Owen County Cousins (J. G. Hauser, Inc., 1977) For repository information see: WorldCat; entry for William Henry Hilsabeck, p. 562
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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: