Harley, we agree on this, I think. Our efforts to accept Grace and endeavor to not slip up is our cooperation with that Grace. And yes, Mary is full of Grace.
You missed the point. We can and always choose the wrong course in our lives. We can and never choose the right way. While Protestants accept that Christ is our atonement and the perfector of our faith, Catholics feel there is a need to work one’s way. Thus the purpose of purgatory. Of course Mary would have been excluded.
Would you say that Judas could be in purgatory?