The Encyclical Mystici Corporis from Pope Pius XII (1943) holds that Mary was also sinless personally, "free from all sin, original or personal". The catechism of the Catholic Church teaches that by the grace of God "Mary remained free of every personal sin her whole life long".

Did the Virgin Mary have original sin?

The Catholic Church teaches that the Blessed Virgin Mary was born without Original Sin because she, too, was conceived without Original Sin. We call her preservation from Original Sin her Immaculate Conception. Mary, however, was preserved from Original Sin in a different way from Christ.

How do we know Mary was immaculately conceived?

The Roman Catholic Church teaches that Mary herself was immaculately conceived. ~ Mary was filled with divine grace from the time of her conception. ... ~ Mary's immaculate conception was necessary in order for her to give birth later to Jesus without infecting him with original sin.