Which word?
To say that she gave birth to man Jesus is just plain not true.
"Concerning his Son Jesus Christ our Lord, which was made of the seed of David according to the flesh . . ." (Rom. 1:3).
The Apostle Sha'ul (Paul) had no problem making the distinction between Yeshua's lineage "according to the flesh"--which is to say, according to His human nature--and His eternally existent Divine nature. Why do you find it troublesome that I make the same distinction?
kai to gennwmenon agion klhqhsetai, uioV qeou [Luk 1:35]
(and the holy that shall be begotten (of Mary) shall be called the Son of God). Son of God is God. Incarnate Son of God is God. The Child born of Virgin Mary was and is God.