As a Canadian PR you can apply to sponsor your wife, but you have to be residing in Canada in order to be eligible. Also, you should know that you have to reside in Canada for at least 730 days (2 years) of each 5 year period in order to maintain your PR, so you should probably be making plans to return to Canada soon anyway.
If your wife can get visitor status in Canada, you can bring her to Canada with you and apply for her PR while she's in Canada. If she still has valid temporary status in the US, that should enable her to come to Canada as a
visitor, and to have an
outland PR application processed through Buffalo. That would take approximately 4-10 months total. Or you could apply to sponsor her via the inland process: that will take 12-18 months to finalize, as long as you submit her application,
and an extension to her temporary status in Canada, BEFORE the status she's given on entry to Canada expires.
If she currently doesn't have valid temporary status in the States, and if she's from a non-visa-exempt nation, she will have to apply for a visitor visa to enter Canada - and that will probably be refused because she's married to a Canadian PR. In that case you'll have to come to Canada alone and apply to sponsor her, via the outland PR process, through
the visa office that represents her country of birth.
If you can give us a bit more info about her country of origin, and her current status in the US, it'll be easier to give you some idea of how to proceed.