She once again was not the mother of God, that concept denotes that she existed before God, and ushered Him into existence.
Please, worry about your own heterodoxy, not whatever silly ideas you can dream up.
"And since the holy Virgin brought forth corporally God made one with flesh according to nature, for this reason we also call her Mother of God, not as if the nature of the Word had the beginning of its existence from the flesh. For 'In the beginning was the Word, and the Word was God, and the Word was with God,' and he is the Maker of the ages, coeternal with the Father, and Creator of all; but, as we have already said, since he united to himself hypostatically human nature from her womb, also he subjected himself to birth as man, not as needing necessarily in his own nature birth in time and in these last times of the world, but in order that he might bless the beginning of our existence, and that that which sent the earthly bodies of our whole race to death, might lose its power for the future by his being born of a woman in the flesh." (St. Cyril of Alexandria, third synodical letter to Nestorius)
As we sing to the Virgin: tu quae genuisti, natura mirante, tuum sanctum Genitorem-"You who, while nature marveled, bore your holy Creator."