Just as Jesus Christ's human nature had no father, His divine nature had no mother.
In an earlier post I went on at tedious length about the diploid blue-eyed mother who's husband is brown-eyed. She has a brown-eyed baby. She did not provide the genes for brown eyes. But are you going to say she is the Mother of all of the baby except the brown eyes?
A mother gestates a baby who is part hers and part the father's. If she has a boy it's because a Y chromosome tadpole won the race. But nobody says she is not mother of the entire baby, maleness and all.
The Divinity of Christ is in no way Mary's. Yet she is the mother of the whole Jesus. It's exactly analogous, I think.
To us it seems that you are changing the meaning of "mother".
In those days, it was thought that the father supplied all the , what you might call, "determinant material". Aristotle says "form," but that's a technical terms.
The mother supplied the Hyle (pronounced HUGH-lay), the stuff.
Now we kn ow that the mother provides some of the determinant material and all of the 'stuff' while the father supplies tadpoles who vector the rest of the determinant material to the ovum. LOTS of the characteristics of the baby come from the father.
So all we're saying is that Mary was the mother of the child a lot of whose crucial "determinant material" was not from her. Just like any other mother.
This is the view of the Nestorians, condemned as heretics in the mid 400s. Nestorius was Patriarch of Constantinople and he taught that there were two persons in Christ, the one human, the other divine. Logically he had to deny that Mary is the Mother of God. He said she should be called Christotokos (Christ bearer), but not Theotokos (God bearer). The doctrine of this heresy was addressed at the Council of Ephesus in 431AD. The Church pronounced that Christ is only one person, not two. Therefore, Mary is the mother of that person and if that person is God then Mary is the Theotokos and deserves to be called the Mother of God. It was from the ruling of this council that "Holy Mary, Mother of God" was added to the "Hail Mary."
Just as Jesus Christ's human nature had no father, His divine nature had no mother.
Those who do not know history are doomed to repeat it. Those without the Church's guidance are doomed to repeat errors millennia old...