No, she was a sinner, just like you and me, born with the sinful nature of Adam. - Read God's Word.
Romans 3:10
"As it is written, There is none righteous, no, not one"
You yourself must agree that St. Paul is speaking in hyperbole since, in quoting Isaiah, he makes no exception -- not even for the Sacred Human Nature of Christ. Since he did not make exception for Our Lord's sinless human nature, the statement cannot be taken literally. The reason that St. Paul is quoting Old Testament references here (which of course pre-dated both Christ and His mother) was to stir the consciences of his fellow Jews. He wants to show them that they are no superior to the Gentiles by reminding them of the repeated Old Testament apostacies of the Jewish people.
You really do a disservice to your own religion by playing these games of ripping Scriptural passages from their contexts and offering them up as proof of some separate theological point. This silliness demonstrates intellectual laziness and a simplistic approach to things of God.
Furthermore, sir, your posts suggest that your ignorance of Catholic doctrine and practice is of monumental proportions -- certainly greater than that of even the typical FR Catholic baiter. Before uttering any more outrageous misstatements of our faith, please consult a catechism to ensure that your sure-to-be-erroneous post is at least minimally based on actual Catholic teaching.
Genesis 3:15 I will put enmities between thee and the woman, and thy seed and her seed: she shall crush thy head, and thou shalt lie in wait for her heel.
Luke 1:28 And the angel being come in, said unto her: Hail, full of grace, the Lord is with thee: blessed art thou among women.
Luke 1:30 And the angel said to her: Fear not, Mary, for thou hast found grace with God.
Luke 1:35 And the angel answering, said to her: The Holy Ghost shall come upon thee, and the power of the most High shall overshadow thee. And therefore also the Holy which shall be born of thee shall be called the Son of God.
Luke 1:42 And she cried out with a loud voice, and said: Blessed art thou among women, and blessed is the fruit of thy womb.
Luke 1:48 Because he hath regarded the humility of his handmaid; for behold from henceforth all generations shall call me blessed.
Typology teaches Mary's sinlessness. The Ark of the Old Covenant prefigured Mary, the Ark of the New Covenant. How could Mary have fullness of grace if she were touched by sin, since every sin diminishes grace? Catholics do not worship Mary. Catholics worship God alone. Catholics honor Mary because Jesus honored Mary and we are called to imitate Christ.
Do you believe in the Trinity, the canon of the Bible and the death of the last Apostle closing the deposit of faith? If yes, then tell us where we can find these explicitly mentioned in the Bible.