[P-Marlowe]

That's Nestorianism.

Is Mary the mother of Christ's divine nature?

Did Christ's divine nature come into being at the incarnation?

Was the Trinity in place before the Incarnation or did the Trinity come into existence at the birth of Christ?

[adiaireton8]

Mary is not the mother of a mere nature. She is the mother of a Person. The child whom she bore is a person, i.e. the Second Person of the Trinity.

-A8