[Scotswife]

You are arguing against a fact that is not in dispute.
The problem is not the definition of of bodies or souls - the definition in question is “mother”. What it means to be a mother.

this also falls into the realm of the long ago condemned heresy of nestorianism....

http://www.newadvent.org/cathen/10755a.htm

I’ll say it yet again...Elizabeth called Mary “mother of my Lord” - and so do I.

[William Terrell]

All we know experientially and a priori about the nature of material and spiritual reject the notion that a mother creates a soul when she creates a body.

It's really convenient to put a name on an observation of reality and call it a "heresy". Your link is filled with Catholic notions of reality, which I find to be neither scriptural nor observable.

Mary is the mother of the Body of Jesus Whom God inhabited as Christ. Mary did not create God. The notion she did is absurd.

When you gave birth to your children, you built their bodies, not their souls. The notion that is even possible is found nowhere in scripture. Therefore also absurd.

Goodness, lady, do you not read the Bible for yourself? If the magisterium said water runs uphill, would you believe it in spite of what's before you eyes?