"Hail! Full of Grace, the Lord with with thee!" ~Gabriel to Mary
This did the Lord reveal to us the name He bestowed upon Mary, "Full of Grace" which means there is nothing within her soul besides grace. She lived her entire life from the moment of her conception free from all stain of sin, including original sin and thus was perfectly conformed to the will of God.
"Behold the Handmaid of the Lord, may it be done unto me according to your word." Mary's response to Archangel Gabriel