The only ‘evidence’ I am aware of is the charge that she was a registered Voter in Canada. I do not know if that is true. I also do not know if it is true that only Canadian citizens can register to vote there. That makes sense to me, but I still do not know.
I checked on that.
It seems that the rolls are kept by residence with a district and not by eligibility.
So, if you live in some precinct in Toronto, then your name is on that list whether you are an eligible voter or not.
That gets sorted out differently.