Her parents and siblings appear to be correct. Slight differences in name & birth date. I was able to add a death date. More sources will be added later.
Sources
"West Virginia, U.S., Marriages Index, 1785-1971" database, Ancestry (https://www.ancestry.com/discoveryui-content/view/10851876:2538: accessed 23 Nov 2022) Flornie M Pennington, gender Female, spouse Chester Whitt, gender Male, marriage date 1912, marriage place Tucker, West Virginia, United States
"United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:XMHB-ZYF : accessed 24 November 2022), Florna N Whitt in household of Chester P Whitt, Huntersville, Pocahontas, West Virginia, United States; citing enumeration district (ED) ED 9, sheet 14B, line 58, family 275, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2551; FHL microfilm 2,342,285.
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:K7ZK-L1M : 8 January 2021), Florna Whitt in household of Chester P Whitt, Huntersville Magisterial District, Pocahontas, West Virginia, United States; citing enumeration district (ED) 38-11, sheet 8B, line 59, family 131, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 4438.
"West Virginia, World War II Draft Registration Cards, 1940-1945," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q2CP-SPJ5 : 14 March 2020), Florence May Pennington in entry for Robert Hamilton Whitt, 30 Jun 1942; from records extracted by FamilySearch and images digitized by Ancestry citing Marlinton, Pocahontas, West Virginia, United States, "Draft Registration Cards for West Virginia, 10/16/1940 – 3/31/1947, "NAID 2658141. Records of the Selective Service System, 1926 - 1975, RG 147. National Archives at St. Louis, Missouri.
"West Virginia Deaths, 1804-1999," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:NMHZ-74G : 10 March 2018), Florna Pennington in entry for Mary Virginia Pifer, 01 Oct 1951; citing Pocahontas, West Virginia, County Records, 13240, county courthouses, West Virginia; FHL microfilm 1,984,248.
Find a Grave, database and images (https://www.findagrave.com/memorial/51909782/flora-p-whitt: accessed 23 November 2022), memorial page for Flora P. Whitt (1890–1957), Find a Grave Memorial ID 51909782, citing Mountain View Cemetery, Marlinton, Pocahontas County, West Virginia, USA; Maintained by Barbara A "Bobbie" Sharp (contributor 46998863) .
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DNA Connections
It may be possible to confirm family relationships with Florna 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 Florna: