Oh, no, sorry, she can't actually be Canadian then.
The thing is, one of the primary qualities, the absolutely essential quality of being Canadian is, one must feel compelled to count anyone even vaguely Canadian-esque, as Canadian. For example, Alexander Graham Bell. He was from Scotland, then he lived in Canada, then in the US. But we count him as Canadian! We even count the invention of the telephone, which happened in the US, as a Canadian invention. Because we are sad and pathetic and desperate to be recognised as not just that pathetic empty bit north of the US, where they say "eh" all the time.
So, obviously, if your mum really was Canadian, in even the vaguest possible sense, she a) would have said she was Canadian and b) would have been wearing those stupid maple leaves all the damn time, so you wouldn't have just noticed now.
Ahem. Apparently Canadians annoy me.