Claiming she is the mother of God gives the false impression that His nature came from her. Jesus divine nature comes from the Father, not Mary. Did God, the Creator, precede Mary or did Mary precede God? If Mary preceded God, the Creator, than Genesis is in error.
Is Genesis in error?
Genesis is not in error. God the Father preceded Mary, God the Son preceded Mary, and God the Holy Spirit preceded Mary. The Holy Trinity is eternal. Mary is a creature, and had a beginning in time. But Mary, when she conceived Jesus in her womb, AT THAT MOMENT became the mother of the eternal Son of God made Man. He is one Divine Person with two natures, not two persons. She is the mother of that ONE PERSON.
Google “Nestorianism”, “Christological heresies”, and “Mother of God” for a better understanding of this issue.