The one “Coredemptrix”
With the Coredemption Mary cooperated with Christ in our “regeneration,” as “Mother of all the living” (Gen 3:20). Before the Redemption, in fact, we were all dead by reason of the sin of our first parents. It is since the Redemption, including the Coredemption, by the will of God, that we have been reborn to the life of grace. In this sense the Coredemption and the spiritual Maternity imply each other reciprocally, that is, Mary Most Holy is our Mother because she is Coredemptrix, and is Coredemptrix because she is our Mother.
It suffices here to cite the clear text of Lumen Gentium, 61, where it is affirmed expressly that the divine Maternity of Mary was a redemptive Maternity, entirely aimed at “restoring supernatural life to souls,” for which the Virgin Mary is our “Mother in the order of grace,” viz., has begotten us to that true life—the life of grace—which makes us “living.”
From this it follows that properly speaking the Coredemption in fieri and in facto esse belongs to the Blessed Virgin Mary uniquely and exclusively, because historically, only she with her suffering immersed in that of her Son,—“under him and with him” says Lumen Gentium, n. 56—cooperated directly and immediately in the universal Redemption, that is, in the very acquisition of salvific grace for all creatures to be redeemed.
If the Coredemption, in fact, is directly linked to the Redemption in actu primo (or objectively), no one can properly be called “coredeemer or Coredemptrix,” except Mary Most Holy. Only in an improper sense, then, can one employ the terms coredeemer or Coredemptrix in place of the more accurate term, “mediator or Mediatrix,” in relation to the Redemption in actu secundo (or subjective), to which the Marian, maternal Mediation of grace is linked, viz., the application or distribution of all graces of salvation and sanctification. These are the graces already acquired by the Redeemer and Coredemptrix in actu primo. i hope this with help bless you all