[xzins]

Thus Mary is not only conceived immaculately, that is, without stain of sin. She also is the Immaculate Conception. Her entire being was specifically created by God with unique privilege so that she could fulfill her role in God’s plan of salvation. “Free from sin,” both original and personal, is the necessary consequence of being “full of grace.”

If it was necessary for Mary to be "free from sin" so Jesus' would not be compromised, then wouldn't the same logic hold for Mary's mother? Would she not have needed to be "from from sin" so that Mary would be free from sin, if it's necessary for Mary to be free from sin to have Jesus free from sin?

And also for Mary's mother's mother...mother's mother's mother....

[Salvation]

The Immaculate Conception is all about Jesus. A pure womb for him in the Ark of the New Covenant.