Mary is absolutely and in every sense the Mother of God. She is the mother of Jesus, in whom the human and divine are perfectly and eternally joined. She is not the origin of her son’s divine nature — but she is the mother of her son, a unique person in whom the divine nature is present as it has been from the first instant of his conception.
People who backpedal on Mary as Mother of God fail to appreciate that this teaching also is really about who Jesus is, and about God’s love for the world being so intimate and complete that he penetrates it and joins himself to it.
Thanks for expanding on that.