On a Montreal french gen-site, I found the following which match your marriage date. Felix, son of Joseph Constantineau & Marie Fontaine married Sept 19 1854 in Iberville, Henryville, Odile Gregoire, daughter of Nicolas Gregoire and Angelique Prevost.
Felix had brothers Joseph and Napoleon and Odile had brothers Midas and Tharsile. If this is your couple then she would be of the Gregoire-Deblois family as follows: Odile, Nicolas & Angelique Prevost, Nicolas& Marg.Senecal, Nicolas &Angelique Mondoux to Jean Baptiste Deblois &Angelique Dumont.Maybe someone can check the Henryville registre to see if her other RC names where: Marie Adelaide Odile..and birth dates as they were probably from the same village around those dates.. Hope this helps...CarolG