Hi there,
First congratulations for getting nominated and best of luck for your wedding. Here is my feedback on your query:
After you become PR, you can sponsor your wife anytime under spousal sponsorship. You are getting married next year, so the earliest you can sponsor her is next year and then it will take 1 year of processing time. There is no financial requirements for sponsoring a spouse and the only history you need to establish is the proof of communication with your spouse, any visits and other proof of relationship etc. I would suggest that you keep proofs of communication even now if you speak with her. As long as you maintain your PR status, you should be good to go. Only thing to consider here is that you'll be financially responsible for her for 3 years when she lands in Canada and you'll have to live away from her most of the duration of your application's processing time. Lastly, if your relationship is genuine then you'll get a visa for her "guaranteed".
If you opt for option 2, then you don't have to wait As student visa has nothing to do with you and there will be no 3 years undertaking etc. She can apply even before you get married. After she lands in Canada as a student, you can marry her legally and apply inland spousal sponsorship. Only drawback is that tuition fees etc are pretty high for international students and there is no guarantee that she'll be able to secure an admission in an institute in Canada. If you think she can definitely get an offer to study in Canada then I would sugest that just go for student visa so u don't have to live away from your spouse after marriage. Just be cautious that you don't try to apply both visas together. if she mentions you in student visa application then there is a possibility of refusal as her intention to study will not be clear. Any visa refusals might impact your spousal sponsorship application in the future.