ok, Migrations site got the St-Nizier from Yves Landry, who doesn't cite where he got particular data along the way in his listing. Have uploaded her marriage record to her profile. It is unfortunately the copy that was sent to central registry and not the one kept in the church, there's not a single signature of witnesses anywhere on the page. They weren't all illiterate by a long shot. And FamilySearch have the same thing, that's where Migrations site get their copies and it is identical.
Don't know where the extra name Jeanne comes from for her mother, Barbe Gauvre appears to be the best reading of her name on marriage record. Maybe you can read it differently.
Guess I have another contract to check up in archives downtown. sigh. One of these days I actually will get down there.