This is an odd statement for a person who accepts the RC dogma of transubstantiation. Doesn't Jesus literally "crawl inside you" at the so-called sacrifice of the Mass? Does that not require you to be born sinless?
But RC dogma only teaches that you need to be in a "state of grace" in order to receivce the wafer. Just as Mary only needed to be in a "state of grace" when the Child was conceived in her womb, not from the time she herself was conceived.
Except that she couldn't have been (absent the Immaculate Conception), because the Sacrament of Baptism wasn't instituted yet. Children (even Jewish children) aren't born in the state of grace, because of original sin.