"Rejoice, you who are full of grace"
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." As such, she was present with the Twelve, who "with one accord devoted themselves to prayer," at the dawn of the "end time" which the Spirit was to inaugurate on the morning of Pentecost with the manifestation of the Church.
Source: Catechism of the Catholic Church (Vatican.va)