My great-grandmother was a teacher in Frontenac County prior to getting married in 1912. I thought I should try to find more about this. Well, I came across a website that said:
There is a comprehensive listing of all Ontario teachers from 1911 to 1966,
which includes qualifications, home address, and salary for each teacher. Known as Public and Separate Schools and Teachers in the Province of Ontario, or variously as Schools and Teachers in the Province of Ontario or The Blue Books, all years are available on Internet Archive.
So checking out the Internet Archive (archive.org) site, I was able to find two years (1911 and 1912) that she was teaching in Sharbot Lake, my great-grandfather's home town. I also discovered that his father was the "secretary of the board" for the school where she taught.