I can not add much details, but I can say that Exilia was indeed the daughter of Joseph Ducharme and Marie Provencher.
She was under 21 when she married Georges Poirier on Feb. O5, 1866, in st-Eusèbe parish, in Princeville, QC. Joseph and Marie were alive at that time. and they lived in Princeville.(source: register on Familysearch).