Um, I'm Canadian, and I've never heard of the personification of Canada as "Mother Canada". Canada is generally personified by an anthropomorphic moose or beaver, or else by a brawny lumberjack. We have no "patriotic image" of Canada, because as a whole, Canadians see national pride as childish and jingoist.
Based on the culture and history of Canada, though, I would probably suggest a young First Nations boy in a white fur (polar bear skin), calling toward the Canadian tendency to be at least a little more respect for the natives (but still really, really badly), Canada's relative youth (only 145 years old), and the importance of the fur industry in founding Canada (and the current pop culture drive in Canada to replace the beaver with the polar bear as the national animal of Canada.
I know this comment is coming very late, and therefore you may have discovered it on your own, in time. But this personification of Canada, known as "The Mourning Mother" is one of the main statues on the Vimy Ridge Memorial in France, which is one of Canada's greatest battles won in World War 1.
Yeah. Canada pays to send our remaining veterans of that fight to that memorial once a year. I'd call that a pretty good use of our tax money (not being sarcastic) to honour those men. There is no such thing as a "good" war; Einstein called war the last resort of the incompetent, but it behooves us to remember those who attended that madness for the sake of others.