Since posting that message in February I have found the record of Agathe Gamelin's burial. She died a few days after her birth (as claimed by Denissen) and was buried at Ste. Anne de Detroit on 17 Oct. 1745. Obviously this Agathe Gamelin, daughter of Laurent Eustache Gamelin, was not the one who married Joseph Normand and had 18 children.
My line from Joseph Normand and Agathe Hamelin is through their daughter Marie Anne who married Antoine Filion in 1795 and then theirgranddaughter Agathe/Angelique Filion (b. 1799) who married Augustin Beauchamp in 1816.