"England and Wales Census, 1841," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M7QX-HPD : 30 October 2015), Louise Philippa Powys in household of Henry Powys, Whitchurch, Oxfordshire, England; from "1841 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing PRO HO 107, The National Archives, Kew, Surrey.
"England and Wales Census, 1851," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:SG85-9Y5 : 21 July 2017), Lousia P Powys in household of Harriet Chapman, Whitchurch, Berkshire, England; citing Whitchurch, Berkshire, England, p. 45, from "1851 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing PRO HO 107, The National Archives of the UK, Kew, Surrey.
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DNA Connections
It may be possible to confirm family relationships with Louise 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.