508 From among the descendants of Eve, God chose the Virgin Mary to be the mother of his Son. "Full of grace", Mary is "the most excellent fruit of redemption" (SC 103): from the first instant of her conception, she was totally preserved from the stain of original sin and she remained pure from all personal sin throughout her life. (emphasis added)
http://www.christusrex.org/www1/CDHN/creed3.html#MARY
Challenge met.
Nice to see that you are getting more familiar with the Catechism; however, this DOES NOT mean that the Blessed Mother was perfect. Are you suggesting that Adam and Eve were perfect before the Fall?