I think you are going too far in removing Mary completely from the crushing of the head of the serpent. As Jimmy Akin explains so well:…Christians have recognized (all the way back to the first century) that the woman and her seed mentioned in Genesis 3:15 …prophetically foreshadow Mary and Jesus. Thus, just as the first half of the verse, speaking of the enmity between the serpent and the woman, has been applied to Mary, the second half, speaking of the head crushing and heel striking, has also been applied to Mary due to the manuscript variant, though it properly applies to Jesus, given the original Hebrew.
This does not mean that the idea cannot be validly applied to Mary as well. Through her cooperation in the incarnation of Christ, so that the Son of God (who, from the cross, directly crushed the head of the serpent) became her seed, Mary
did crush the head of the serpent. In the same way, the serpent struck at Christ on the cross, and indirectly struck at Mary’s heart as well, who had to witness the death of her own Son (cf. John 19:25-27). As the holy priest Simeon had told her years before:
“Behold, this child is set for the fall and rising of many in Israel, and for a sign that is spoken against – and a sword will pierce through your own soul also – that thoughts out of many hearts may be revealed” (Luke 2:34b-35).
Thus Jesus crushed the serpent directly and was directly struck by the serpent; Mary, through her cooperation in the incarnation and her witnessing the sufferings and death of her Son, indirectly crushed the serpent and was indirectly struck by the serpent.
(see
cin.org/users/james/questions/q105.htm)
I don’t quite understand the rejection of Mary’s role in smashing the serpent’s head, since all followers of Christ also play a role here, albeit much smaller than Mary’s - and infinitely less that Our Lord. But he does let us participate in some way:For while your obedience is known to all, so that I rejoice over you, I would have you wise as to what is good and guileless as to what is evil;
then the God of peace will soon crush Satan under your feet. The grace of our Lord Jesus Christ be with you.
(
Romans 16:19-20)
Then of course there’s quite a few OT “types” of Mary who slay the enemies of Israel through various methods of cutting off or striking the head. Tim Staples brought these out in some of his Marian apologetic talks. I don’t have the references with me right now, but you can probably find 'em online.
That is all,
-Peace in Christ-
DustinsDad