The Blessed Mother was not a sinner. She was conceived without the stain of original sin.
Hail Mary, full of grace ...
As I study for RCIA to become a Catholic, I think this is the doctrine that will take me, a former Evangelical, the longest to genuinely put my mind around, though. It's just so antithetical to everything I was taught as a child... but I trust that ultimately God wouldn't be so cruel as to strip me of His truth.
Amen, Land of the Irish!