Mary was predestined to be the Mother of Our Savior, and everything she had, including her holiness, was a gift from Him "Who did great things for her."
There's no such thing as "personal merits" in some sense isolated from God. He certainly gives greater and gives less, as He wills. Jesus said of John the Baptist, "Truly I tell you, among those born of women there has not risen anyone greater than John the Baptist; yet whoever is least in the kingdom of heaven is greater than he." Greater and lesser are both gifts.
Our Lord's remark about the "biological reductionism" of His Mother to womb and breasts, in no way reduces the honor she has as one who "heard the word of God and kept it." She heard it so well it entered her, and she got pregnant with God.
No it raises the saved to His mothers level of love and honor
reading INTO perhaps.
A few verses BEFORE this one, Elizabeth says...
" 45 And blessed is she who believed that there would be a fulfillment of what was spoken to her from the Lord.”
Notice what she did NOT say:
"... blessed is she who AGREED to of what was spoken to her from the Lord.”