I THINK I have your answer. Let me explain. Desilets is a surname "invented" in Quebec. Nobody came from France bearing this name. I have a database of all the Desilets I ever found containing 3200 Desilets families. In it, there are only 7 Esthers. Of those 7, only one comes from a family where the parents married before 1810.
This Esther was born in the village of St-Paul, near Joliette in 1806. I have no outcome for her (no marriage, no death). Two of her siblings married in Windsor ON (L'Assomption parish) that I know of. I have no outcome for her parents and for many siblings.
Although I have no direct proof, for all the above reasons, I think she is your Esther.
Here's her family:
Joseph Mousseau dit Désilets b 1764 (Louis Mousseau dit Désilets & Amable Janot) m 30-06-1783 St-Sulpice (L'Assomption) Angélique Piché (Joseph Piché & Charlotte Gauthier) Farmer living in St-Paul between 1797 - 1806 Children: M Louise, 1787,1787 M Louise, 1788, 1791 Jean Baptiste, 1795, 1800 Marie, 1797 Sophie, 1800 / Toussaint Rhéaume, Windsor, ON, L'Assomption, 07-07-1817 Julie, 1802 M Louise,1804 M Esther, 1806 M Angélique / Charles Chevaudier, St-Paul (Joliette), 17-02-1806 Louis / Marguerite Dénommé, Windsor, ON, Immaculée-Conception,14-04-1825