"Even the official church teaching allows freedom of conscience, which your view does not allow."

False.  The RCC certainly allows freedom of conscience, and Joan certainly knows and accepts this.  What she doesn't accept (among other things, I'm sure) is that freedom of conscience doesn't mean you can believe anything you want and still call yourself Catholic.  Not even common sense allows that.  

One thing you're undoubtedly right about.  (How could you be wrong?)  You say, "I do not believe in your church."  Joan is a knowledgeable, faithful RC.  You're not.  No judgment there, just  a statement of fact which you yourself support.