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"I'm rather surprised that your friend insists that her visitors come via google.com though."
"Most casual searchers will simply be redirected back to google.ca if they tried to use google.com. They would have to be technically literate to bypass it -- something the average search engine users are not."
Maybe her site isn't ranking high locally hence she gets "far and away" traffic as much as local? That could explain why she gets high precentage of google.com
(Bonus points for having a witty retort to site owner about putting lipstick on it in the grave!)