No-one on earth believes that Mary bore God the Father.
The Holy Trinity is three Persons and one God.
Mary bore Christ: the Second Person of the Holy Trinity, who is True God and True Man.
She is certainly Theotokos - or else Christ is not God.
Theotokos is the wrong term. Christotokos is correct. Mary bore Jesus Christ, 2nd person of the Trinity. Not God the Father and God the Holy Spirit. Since Christians believe Jesus is the Christ of God, and 2nd member of the Holy Trinity, Mary is Christotokos. Nestorius was right, Cyril of Alexandria was wrong