But what you quoted was NOT the WORD as in Genesis 3:15. Eve was the mother of all living (Christ is the tree of life eternal) in that she was the beginning of the lineage, even to Mary of Christ. Mary would not have been where she was appointed to be had it not been for Eve. Regardless of Eve's sin, Christ still came through her lineage. And if any or one is tainted by Eve's sin so would Mary...
It takes numerous 'new' cuts on Peter's keys to get to claiming Genesis 3:15 is speaking about Mary.
From the earliest years, Mary was called “the second Eve.” She being , as Tennyson put it, “our tainted nature’s solitary boast.” Understand that the doctrine of original sin is a development of what Paul says on the issue, and as now understood based on the opinion of St. Augustine.The objection to her exemption was that if she were without original sin that she would not need salvation on the cross. My view is that salvation is to be admitted to the presence of God and to see him face to face. Certainly she was sanctified by the Holy Spirit. The doctrine of the Immaculate conception simply says that she was chosen to be the mother of the Messiah and thereby became a pure vessel.