She probably married William Marshall on 28 October 1817 at Lympne, but I'm unable to trace them after that point and the full transcription at freereg.org.uk doesn't have witnesses nor home parishes to help.
Baptism: "England Births and Christenings, 1538-1975," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JMS5-DL7 : 30 December 2014, Ann Sharwood, 20 May 1798); citing Lympne, Kent, England, index based upon data collected by the Genealogical Society of Utah, Salt Lake City; FHL microfilm 1,736,875.
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It may be possible to confirm family relationships with Ann 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 DNA with Ann: