I will advice you not to complicate issues for yourself, leave your application the way you have submitted it . since her first husband had nothing legal with her about marriage, that means they were just dating, it was not a legalized marriage, immigration won't have any interest on that. ... again, when did your wife applied for the US visa? I will need that info for me to assure you if the Canada immigration can have access to her us visa application or not. ... I am talking to you with experience that happened to me personally and right now, I have my passport request mail cooling in my inbox