Question about Mary as Mother of God

If Mary is,as the catechism says “the mother of the eternal Son of God made man, who is God himself,” then isn’t she in a way a necessary cause of the person Jesus Christ? And if so, is God therefore, at least in this way, caused rather than an uncaused cause? If we counter by saying that she is cause only of Christ’s humanity,do we run the risk of falling into the Nestorian heresy of seeing Christ’s humanity as separable (and thus, by extension, potentially not fully divine, as what is separable cannot be essentially God)? Anyway, just a sort of thought experiment I had going today–I’m sure I’m missing something here, but not sure where it is.

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