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I was in a similar situation as your fiancee four years ago. I got married while I was a visitor, my girlfriend, however was a Canadian citizen ( insignificant difference, I hope). I applied for PR after I got married. Got it in about 4 months ( that was then- now, might be longer). Now I am a Canadian Citizen.
When, she arrives, you and her will need to obtain a marriage license. both of you need to be sworn in, and both will need to sign the license. I suggest you phone your local city hall for info.