1796 Zilpha is born in Sevier County, Tennessee. However, one of her Find-a-Grave memorials gives her birth place as Surry County, North Carolina.
1813 Zilpha married Christopher Mulvaney on 9 March in Knox County, Tennessee.
1830 Zilpha and Christopher are living in Blount County, Tennessee.
1840 Zilpha and Christopher continue to live in Blount County, Tennessee.
1843 Zilpha passes away, possibly en route from Tennessee to Illinois as her family was relocating. Her place of death in Marion County, Illinois comes from her Find-a-Grave memorial; however, no sources are cited there. According to that same memorial, she is buried in Marion County, Illinois.
There are two Find-a-Grave entries for Zilpha and Christopher Mulvaney in Phillips Cemetery in Omega Township, Marion County, Illinois. The sign for that cemetery indicates that it was established in 1852, which was 10 years after Zilpha passed away. Also, her headstone does not indicate a date of death, but one memorial gives a date of death of 1842; the other 1850. They also both give her birthplace as Surry County, North Carolina rather than Sevier County, Tennessee. Neither identifies a source for the information. So, we are back to wondering when and where she died. I will send a note to the creator of the memorial for more information. -- Fiscus-32 12:35, 23 March 2015 (EDT)  One of the memorials on Find-a-Grave gives Zilpha and Christopher's children as:
The information I had on her originally said that she died in Jefferson County, Iowa, but a source was never provided. According to Erik Frette, whose wife is a direct descendant, Zilpha died as her family was moving from Tennessee to Illinois. I'm deleting her place of death until I am able to find more information. -- Fiscus-32 15:00, 11 January 2017 (EST)
"We have no record of Zilpha after the birth of her last child, Mary Elvira. It has been said that Zilpha died on the way, yet another story is that Christopher came to Omega Twp. Illinois with his wife and eleven children. We do know the trip was made in a covered wagon pulled by two oxen, Buck and Jerry..."
↑ "Tennessee, County Marriages, 1790-1950," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XZ43-KTB : accessed 12 April 2016), Christopher Mulvaney and Zilpha Underwood, 09 Mar 1813; citing Knox, Tennessee, United States, Marriage, p. 15, Tennessee State Library and Archives, Nashville and county clerk offices from various counties; FHL microfilm 1,020,951.
It may be possible to confirm family relationships with Zilpha by comparing test results with other carriers of her 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 DNA with Zilpha: