I use Canada 411 daily,If you look there is a reverse lookup,When the number is found,You can type her number in,And if she has registerd her address with the number it will come up,Some dont..I dont have my address appear in the phonebook.

This first one is for the address
http://findaperson.canada-411.ca/reverse_phone

http://findaperson.canada-411.ca/reverse_address

I dont know if that will help,hope it does