Lest we miss the point -Let me break it down - this discussion is about free will.
Eve chose to say no to God and let sin into paradise. Mary chose to say yes to God and let the Rededemer come. If Mary had said no - no Redeemer. Mary is the new Eve.
Mary is the new ark of the covenant.
This does not take away from Our Lord’s sacrifice. The plan is perfect - God made humans and only human’s could help him fix it.
Again - to reiterate - free will is the issue here. If humans had no no free will we would have been just pretty creatures - and God wanted us to be “like” him with intellect and reason.
The whole Mary situation is a reflection of this!! It’s not a difficult concept.
sorry - meant let the Redeemer come
Are you saying Catholic doctrine says sin came through Eve? I do not know but, Thank God, God knows.
But it’s still wrong.
The sin was not Eve’s that Mary should atone for it.
It was Adam’s. The sin and sin nature comes through the man.