Octavie married Louis Lavallee in Saint-Boniface on 2 February 1875.
She may have died in Saint-Boniface on 29 November 1890. There is a death record for an Octavie Riel (but that's her maiden name, and Manitoba death records normally use the married name) who was the right age. However, in other online trees a death in Quebec in December 1890 is cited. (To do: look up death record in Drouin Collection.)
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↑1870 Census of Manitoba, page 68, St. Vital Parish. Octavie is mistakenly enumerated as a boy named Octave in this census.
It may be possible to confirm family relationships with Octavie by comparing test results with other carriers of her 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 Octavie: