JAMO1973 said:
What I am confused about is why would it be easier to file before we are married and not after? I don't want to misrepresent anything. I want to be honest and say that I want to bring my wife to Canada so we can visit my family and friends. There is no alterior motive. We are in NO hurry for the residency as I have a good job here in Mexico. We just want to visit Canada as I haven't been back for 6 years and she has never been.
In order for your wife to get a TRV, she would need to show that she intends to leave Canada after the TRV expires. For many people with a Canadian spouse, this is often hard to do if the spouse lives in Canada, since a visa officer may feel the strongest tie to the applicant is the spouse and they will end up staying in Canada illegally even after TRV expires.
Your case is a bit different since you both live in Mexico. So she would have a good chance to get TRV, even if married to you. You would need to show her ties to Mexico such as proof of ongoing employment, home ownership, the fact that you (spouse) are employed/live there full time, etc etc. Basically anything you can include that will show she will return to Mexico after TRV is done.