I have been enjoying how marvelous some of the Reformed writers of the late 19th century have articulated thoughts on the Uberdisciple (my term), Mary the mother of Jesus:
Mary enjoyed a high honor, an honor greater than the prophets and apostles ever had. She is the blessed, the favored, among women, and the mother of the Lord.
Bavinck, Herman. Our Reasonable Faith. p 336.
The person born of the Virgin Mary was a divine person. He was the Son of God. It is, therefore, correct to say that Mary was the mother of God. For, as we have seen, the person of Christ is in Scripture often designated from the divine nature, when the predicate is true only of the human nature. On this particular form of expression,
which, from its abuse, is generally offensive to Protestant ears, Turrettin remarks:
“Maria potest dici vere θεοτόκος seu Mater Dei, Deipara, si vox Dei sumatur concrete pro toto personali Christi, quod constat ex persona Λόγου et natura humana, quo sensu vocatur Mater Domini Luc. i. 43, sed non precise et abstracte ratione Deitatis.”
Hodge, Charles. Systematic Theology.
Vol 2, p 393.