You still haven't laid it out in the form of an argument. Here you go:
(1) Jesus is God
(2) The Father is God
(3) Jesus and the Father are one.
(4) There is only one God
(5) Mary is Jesus's mother.
(6) Mary is the mother of God.
Therefore,
(7) Mary is the mother of the Father. [from (2), (4),(6)]
But the conclusion does not follow. That is because there are three Persons in God. Mary is the mother of God because she is the mother of the Second Person of the Trinity. She is not the mother of the Father or the Holy Spirit. And yet, because the Second Person of the Trinity is God, and because Mary is the mother of the Second Person of the Trinity, it is nevertheless true that Mary is therefore the mother of God.
-A8
Mary is a creature, not part of the Godhead; therefore she was among the "every thing" made by Christ and for Him.
I believe her title should be simply, the blessed mother of Jesus. IOW, her motherhood is tied to His being enfleshed - nothing more.