Lucille Lagace, daughter of Louis & Marie Fournier married Pierre Roy, son of Bernard & Madeleine Boudreau on Nov 26, 1860 in Ste Famille, Bathurst, NB(Source:Repertoire genealogique ... Mignier-Minier-Meunier, Lagacé-Lagasse-Lagacy by Jean-Guy Lagace).
Her parents, Louis & Marie, married Nov 28, 1826 in Petit Rocher, NB. Louis Lagacé was the son of Louis & Madeleine Lévesque. Marie Fournier was the daughter of Jacques & Angélique Couture.
You may possibly get a better lead on Lucille's birth date by starting in her parent's place of marriage or even that of her own.