She was married twice, first to Henri Firmin Comeau and then to Jerome Melanson.
Sources
Karen Theriot Reader Marie Marguerite citing Diocese of Baton Rouge, CATHOLIC CHURCH RECORDS; 1770-1803; vol. 2, Baton Rouge, LA, Diocese, 1980; p. 367; California State Library Sutro, F377 B3C3 v.2. (SGA-11, 76, #371).
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DNA Connections
It may be possible to confirm family relationships with Marie Marguerite by comparing test results with other carriers of her ancestors' mitochondrial DNA.
Mitochondrial DNA test-takers in the direct maternal line:
W W :
AncestryDNA Maternal Lineage (discontinued), haplogroup W1 +
Family Tree DNA mtDNA Test Full Sequence, haplogroup W1-T119C