There are many different Lavigne families here in Eastern Canada. There are the Tessier dit Lavigne, Nadeau dit Lavigne as well as Poudrette dit Lavigne. All these families originated in Quebec. While most Tessiers and Nadeaus kept their names, the Poudrettes all became Lavignes. I would say that Avril's ancestry is related to one of these three families, with an incline towards the Poudrettes dit Lavigne. These seem more plausible than the Lavigne connection from Nova Scotia. But who knows.