True enough, she did not give birth to the divinity, which would be blasphemous nonsense. But she did give birth to the divine person of the Word in his humanity, thus mother of God. When we speak of someone being the mother of another, or of bearing that person in the womb, we always look to the individual. The divinity of the Word isn't a personal subject, nor is his humanity. We don't speak of people giving birth to natures, but rather persons.
Anyway, why was this antique of a thread resurrected?