Barbara and her sister of the same name share the same gravestone.
"Prince Edward Island Baptism Card Index, 1721-1885," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KCX8-6GS : accessed 16 Nov 2014), John Casely in entry for Barbara Ann Casely, Nov 1874; citing p. 17, volume 1, Kensington , Prince Edward Island, Public Archives, Charlottetown; FHL microfilm 1487752.
It may be possible to confirm family relationships with Barbara 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 Barbara: