Catechism of the Catholic Church
b, c, and d. Para. 721: Mary, the all-holy ever-virgin Mother of God, is the masterwork of the mission of the Son and the Spirit in the fullness of time. For the first time in the plan of salvation and because his Spirit had prepared her, the Father found the dwelling place where his Son and his Spirit could dwell among men. In this sense the Church's Tradition has often read the most beautiful texts on wisdom in relation to Mary (Cf. Prov 8:1-9:6; Sir 24). Mary is acclaimed and represented in the liturgy as the "Seat of Wisdom."
Para. 723: In Mary, the Holy Spirit fulfills the plan of the Father's loving goodness. Through the Holy Spirit, the Virgin conceives and gives birth to the Son of God. By the Holy Spirit's power and her faith, her virginity became uniquely fruitful (Cf. Lk 1:26-38; Rom 4:18-21; Gal 4:26-28).
Para. 726: At the end of this mission of the Spirit, Mary became the Woman, the new Eve ("mother of the living"), the mother of the "whole Christ" (Cf. Jn 19:25-27).