Does the "fullness of time" in Galatians 4:4 depends on Mary's state of grace?

> But when the fullness of time came, God sent forth his Son, born of a woman, born under the law. (Galatians 4:4) When God finally sent angel Gabriel, the encounter begins with an unusual greeting The scriptures does not mentioned any passages that an angel more so a higher rank angel belonging to the Choir Cherubim would bow down to a lowly woman saying; "Hail! Full of Grace." (Luke 1:28) This was only a greeting coming from an archangel not yet the message of God to the chosen woman who was not yet even overshadowed by the Holy Spirit. Archangel Gabriel reveals the state of the soul of Mary, and it was already "full of grace". Pope Francis said, "nobody is born a saint, they become thus" and scriptures affirmed this as even Jesus needed to grow in wisdom and grace. Mary like all mankind including Jesus had to merit graces by living a life of humility & obedience. Does the "fullness of time" mean God had to wait for Mary to reach the "full of grace" stature in order for Her to say Her FIAT? Mary was born bestowed with a singular privileges but not yet full of grace as Jesus was born empty coming in the form of slave and needed to acquire wisdom and graces too. Does the "fullness of time" depends on Mary's readiness to accept God's Will by reaching the stature "full of grace"?