Just to get you straight, about “Mother of God” you aren’t saying that Mary was there from the beginning with God in creation are you? You aren’t saying that she was part of the Trinity (or would it be a Quadrinity?) I hope not.
Because I do know that Jesus (as both God and man) as separate from the Father, yet very much a part of the same being who is The Father/Son/Spirit ONLY came from God when he became flesh. I hope you’re not saying something different.
Mother means the one who gave birth.
Mary is the mother of God Incarnate, the Word become flesh.
Why is this hard to say?
The Incarnation was not “normal.”