Hello? Do you believe in Christmas?
I don't care if you leave it alone or not. Mary bore Christ in her flesh. Of COURSE she had a part in the redemption. Are you nuts?
Nope, not going to drop this one then. You asked for it, now grin and bear it.
Yes, Mary carried Christ in her womb. That's been established and is not in question. That, also, is not part of our redemption.
The Redemption of Mankind, per the Catholic Encyclopedia, is the restoration of man from the bondage of sin to the liberty of the children of God through the satisfactions and merits of Christ. Notice that no where in there is Mary's name mentioned? Mary was not and is not our Redeemer. Oh, and here's the link so you don't get your nickers in a twist.
So quit calling Mary the Co-Redeemer. She's not got any part in the Redemption of Mankind. She carried Christ in her womb, nothing more and nothing less. Christ redeemed us by His own sinlessness, not with any help from any human.
It is Christ and Christ alone who deserves honor and worship as our Redeemer, no one else!