After her father Allen's death in 1837, it appears that Sarah was adopted by her uncle Samuel Ackrill, as she is listed in the 1851 census as Samuel's daughter. She married sometime before the 1841 census.
Sources
"England Births and Christenings, 1538-1975," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:NGNB-Z75 : 30 December 2014), Allen Ackerill in entry for Sarah Ackerill, 21 Jul 1818; citing , reference ; FHL microfilm 501,834, 501,835, 501,836, 502,177, 502,178.
"England and Wales Census, 1841," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MQ5B-P6N : 30 October 2015), Sarah Stevenson in household of Samuel Ackrill, Claines, Worcestershire, 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:SGCF-WM2 : 24 July 2016), Sarah Stephenson in household of Samuel Ackrill, Tything Of Whistones Claines, Worcestershire, England; citing Tything Of Whistones Claines, Worcestershire, England, p. 54, 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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