It appears Louise's surname is different in several records.Her surname appears as Bonier dit Laplante, Plante, Bogné, Bonnier, Bernier, Roque, Bonier and Bagner. Phew!
Julien Fontaine [Etienne & Catherine (Marie) Gaudin] m.20-Nov-1797 Notre-Dame-du-Rosaire, St-Hyacinthe, St-Hyacinthe, Quebec Louise (Marie) Bonier dit Laplante [widow of Pierre Porreau]
I haven't researched her previous marriage. So I don't have her parents yet. This should get you on the right track. The only place her surname appears as Roque is in "Repertoire des mariages de la paroisse Notre-Dame-du-Rosaire comte de St-Hyacinthe 1776-1938 inclusive".Blue Drouin, Loiselle and the same publication stated list her surname as Bonier.