Betty Scharffe has her birth date as Mar 18, 1862, as does Barb Malchuk. I had 1864. I had found a census record for Mar. 18 1851 - but I don’t think (now) that this is the same Sara Jane Davis.
Her tombstone says 1862. So, there may have been two different Sarah Jane Davis’ that I found. Going with the 1862 date.
Sarah Jane signed the “Official return of birth” for her nephew Wellington Boyle, and was his official guardian at that time, on June 10, 1918. She was living in Centreview at the time.