The OCFA (Ontario cemetery finding aid) has an entry for Willametta Moore in Athens Village, Leeds County, Yonge Rear Twsp. I would check that out. Seems more plausible as other children, George Frederick and Bryce are buried in Leeds County as well as Joel.
There was a David Henry Moore married to Wilhemenia Hope who lived in the Peterborough area and his daughter Mary Lang Edwards Dickson is found in Keene Lower Cemetery with a death date of 14 Sept 1963. Families confused? Her marriage record did show father as Davis rather than David.