[tjwmason]

Mary was the mother of the human nature of a person, the only person ever, who was God and man. She was not "mother" of his Divine nature.

May I, in all humility, suggest that you read the history of the Second Council of Ephesus. The Council settled that Our Lady was to be called Theotokos (literally God bearer, translated into Latin as Mater Dei, thence to Mother of God), the opposition was lead by Nestorius who maintained that she was merely Christotokos (Christ bearer/ Mother of Christ). Nestorius was declared a heretic, and all who support his view were anathematised.

[Praxeus]

Mary is "Mother of God" only in a derivative sense. That is, she is mother of what God took upon Himself: Flesh.

7 But made himself of no reputation, and took upon him the form of a servant, and was made in the likeness of men:
8 And being found in fashion as a man, he humbled himself, and became obedient unto death, even the death of the cross. - (Phil 2:7-8 KJV)

She was mother of the "likeness". Does that mean more than being mother of just any man? Absolutely. Does it mean she was mother of the eternal Spirit that was in the man? Nyet.

When the Spirit left the body, the humanity died. God cannot die. Mary was mother of that which died. At the end of Mel's movie, she is holding in her arms that which she was mother of. And with the death of that, she is mother no more, save in a memorial sense.

For he hath made him to be sin for us, who knew no sin; that we might be made the righteousness of God in him. - (2 Cor 5:21 KJV)

What she mothered became a sacrifice, that is, it became sin for our sakes and is no more.

The adamic nature of Jesus is gone forever. What was of Mary, her "seed", had to be destroyed for our sakes. If she is still mother in an actual sense, we are still in our sins.

I know many will disagree here, but it is my view.