There are Roman Catholic scholars that have interpreted that it is Mary who crushes the serpent under her heel. Note the Douay-Rheims translation:
I will put enmities between thee and the woman, and thy seed and her seed: she shall crush thy head, and thou shalt lie in wait for her heel.
Genesis 3:15 Douay-Rheims
Pope Pius 1x, Ineffabilis Deus Wrote:
Hence, just as Christ, the Mediator between God and man, assumed human nature, blotted handwriting of the decree that stood against us, and fastened it triumphantly to the cross, so the most holy Virgin, united with him by a most intimate and indissolvable bond, was, with him and through him, eternally at enmity with the evil serpent, and most completely triumphed over him, and thus crushed his head with her immaculate foot.
The issue with the RCC position is that the notion of Mary crushing the serpent’s head is contrived over an incorrect translation of Genesis 3:15! The scripture was from the Latin texts of the Vulgate. This has been the official Bible of the RCC since the fourth century.
The truth is that the Scripture was written in Hebrew and the subject is in the masculine and not the feminine. This verse is speaking prophetically of Jesus Christ our Savior’s victory over Satan. Nothing to do with Mary in the least.
The Hebrew scripture reads: “He shall bruise you on the head” Genesis 3:15 (NASB).
Please pray that the Roman Catholic follower turn to Christ and not the Magisterium.