Miriam and the Israelites sing of God's salvation:
I will sing to to the Lord, for He has triumphed gloriously.
Horse and rider He has hurled into the sea.
The Lord is my strength and my might;
He is become my deliverance.
This is my God and I will enshrine Him;
The God of my father, and I will exalt Him.
(Exodus 15: 1-2)
That is Mary's vocation as well, to exalt the Lord and to enshrine the Word of God in this world so fully and literally that she becomes the first home of the Word made flesh. The virgo facta ecclesia, the "Virgin made Church," as St. Francis puts it so beautifully.