I'm not trying to be silly or obtuse. I am trying to discuss the implications of predestination as opposed to foreknowledge. Mary was not a victim or a divine broodmare. She was preserved sinless because God knew she would cooperate perfectly with Grace.
Peace be to you.
Even if she had said "no" and God put His plan in place despite her defiance she would not have been either a victim or "broodmare" as you put it.
You can't be a victim of God. And she would not have been a broodmare (no sex act involved) but a receptacle of Salvation to mankind.