She said it's more common in the U.S., where people walk into their house and just don't take their shoes off. I've never seen anyone in Canada do this, unless they were planning on leaving again right away.
TQC - is it really more common to wear your shoes around the house in the U.S.?
ETA: Oh my goodness, the things I learn! I'll keep this in mind if I travel the U.S. - If you travel to Canada, definitely take your shoes off! :P