Commenting on Luke 1:26-38, the announcement of Jesus birth, St. Ambrose of Milan (+397) makes a connection between Mary and the Church. :
And, therefore, the Evangelist, who had undertaken to prove the incorrupt mystery of the incarnation, thought it fruitless to pursue evidence of Marys virginity, lest he be seen as a defender of the Virgin rather than an advocate of the mystery. Surely, when he taught that Joseph was righteous, he adequately declared that he could not violate the temple of the Holy Spirit, the mother of the Lord, the womb of the mystery. We have learned the lineage of the Truth. We have learned its counsel. Let us learn its mystery. Fittingly is she epsoused, but virgin, because she prefigues the Church which is undefiled (cf. Eph 5:27) yet wed. A virgin conceived us of the Spirit, a Virgin brings us forth without travail. And thus perhaps Mary, wed to one, was filled by Another, because also the separate Churches are indeed filled by the Spirit and by grace and yet are joined to the appearance of a temporal Priest. [Exposition of the Gospel of Luke 2.6-7]Read more
Commenting on Luke 1:39-45, the when Mary journeys to visit her cousin Elizabeth, St. Augustine of Hippo (+430) speaks of the infant John, to be known as the Baptist, leaping in the womb at the sound of Marys voice:
We see instances of leaping no only in children but even in animals, although certainly not for any faith or religion of rational recognition of someone coming. But this case stands out as utterly uncommon and new, because it tool place in the womb, and at the coming of her who was to bring forth the Savior of mankind. Therefore this leaping, this greeting, so to speak, offered to the mother of the Lord is miraculous. It is to be reckoned among the great signs. It was not effected by human means by the infant, but by divine means in the infant, as miracles are usually wrought. [ep 187.23]Read more