Ave Maria, Gratia Plena, Dominus Tecum

Through the centuries the Church has become ever more aware that Mary, "full of grace" through God, was redeemed from the moment of her conception.
The "splendor of an entirely unique holiness" by which Mary is 'enriched from the first instant of her conception' comes wholly from Christ: she is 'redeemed, in a more exalted fashion, by reason of the merits of her Son.'

The Father blessed Mary more than any other created person 'in Christ with every spiritual blessing in the heavenly places' and chose her 'in Christ before the foundation of the world, to be holy and blameless before him in love.'

The Fathers of the Eastern tradition call the Mother of God "the All-Holy" (Panagia) and celebrate her as 'free from any stain of sin, as though fashioned by the Holy Spirit and formed as a new creature.'
By the grace of God, Mary remained free of every personal sin her whole life long. - Catechism of the Catholic Church, 491-493

For more in depth reading about Mary I recommend a very a nice site put together by The Marian Library/International Marian Research Institute, Dayton, Ohio