The Catholic Bible has a few ‘selective’ renderings of words, such that the DR is not in agreement with so many translations. But that will escape your understanding. The Catholic Bible starts early changing meanings to fit the traditions, like the passage in Genesis regarding ‘someone bruising someone’s heal’. But don’t fall into a tizzy, the Mormons do the same stuff using their Book of Mormon.
Regarding the immaculate conception:
No direct or categorical and stringent proof of the dogma can be brought forward from Scripture. But the first scriptural passage which contains the promise of the redemption, mentions also the Mother of the Redeemer. The sentence against the first parents was accompanied by the Earliest Gospel ( Proto-evangelium ), which put enmity between the serpent and the woman : "and I will put enmity between thee and the woman and her seed; she (he) shall crush thy head and thou shalt lie in wait for her (his) heel" ( Genesis 3:15 ).
The translation "she" of the Vulgate is interpretative; it originated after the fourth century, and
cannot be defended critically.
Of the major translations on the DR renders this passage this way.
The catholic encyclopedia admits it cannot be defended yet they continue with it.
Bad translation = bad theology