Margaret's profile is Farriage-1. The biography recites that the 1891 Canada census reports her birth location as Scotland. It appears to be Gaelic in origin and may be found both in Scotland and Ireland.
EDITED TO ADD:
Check out these two blog posts, in which the writer supposes that "Farriage" was an error in the Census report.
Finding Margaret Farriage and More options for the Margaret Farriage query
If there is any chance you could get somewhere to obtain and read microfilm, there may be a possibility of an early census record.
Check out this link to Census Returns on Microfilm, 1770-1856 from Library and Archives Canada.