A COPR is issued after a decision is made, but before you land. You then land, and become a PR. Some time after then - normally about two months - you get a PR card. If she has a card then yes, it's probably too late, but that's not the deciding point. The question is has she used her COPR to land (for an inland app, that normally means an interview at a CIC office).
I presume from you saying you filed an appeal that she has done, and at that point C51 still existed (although may not have been applied considering the length of the relationship you said).
From what you say, it sounds like you were completely duped and taken advantage of. I agree with scylla, you should see if you can put together enough evidence that she never intended to be in a long-term relationship with you, and see if CIC will respond to the possibility that she gained PR status by fraud.