Without Mary, there would be no Jesus. Without Jesus, there would be no life. Christ, the Redeemer, and Mary, the Mother of the Redeemer, brought spiritual life to a world dead in sin. Saint Paul pairs the life-giving Christ with Adam in 1 Corinthians 15:22: "And as in Adam all die, so also in Christ all shall be made alive."
Saint Paul explains in Roman 5:19, "For as by the disobedience of one man, many were made sinners; so also by the obedience of one, many shall be made just." Echoing his words paragraph 411 of the Catechism of the Catholic Church (CCC) tells how Christ reset life: "[T]he 'New Adam' who, because he 'became obedient unto death, even death on a cross,' makes amends superabundantly for the disobedience, of Adam."
After the head of mankind fell God announces the coming of Christ and His Virgin Mother in what's called the Proto-evangelium, or first gospel. God conveys to Satan this future triumph over the devil's work of sin and death in Genesis 3:15: "I will put enmities between you and the woman, and your seed and her seed: she shall crush your head, and you shall lie in wait for her heel."
The CCC in paragraph 411 affirms this "battle between the serpent and the Woman" involves "Mary, the mother of Christ, the new Eve." The Catechism adds how Mary's sinless role as the "new Eve" depended upon God's grace: "[S]he was preserved from all stain of original sin and by a special grace of God committed no sin of any kind during her whole earthly life."
When Pope Pius IX in 1854 proclaimed Mary's Immaculate Conception he emphasized her role foretold in Genesis 3:15: "[T]he most holy Virgin" in closest union with her Son, the Redeemer, was "eternally at enmity with the evil serpent, and most completely triumphed over him, and thus crushed his head with her immaculate foot."
See how the new Adam and Eve reset creation to an even higher level than before the Fall in season one of Church Militant's Premium show Armor of God—The Incarnation.