Official death index indicates she was 19 years old at death.
Sources
Baptism: freereg.org.uk
Death: gro.gov.uk, GRO Reference: 1849 D Quarter in LANGPORT Volume 10 Page 336
1841 Census: "England and Wales Census, 1841," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MQ1Q-47H : 13 December 2017), Louisa Sams in household of Thomas Sams, Long Sutton, Somerset, 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.
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DNA Connections
It may be possible to confirm family relationships with Louisa 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 Louisa: