Catechism of the Catholic Church §411 — English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va (official text, quoted at the cited paragraph)
The Christian tradition sees in this passage an announcement of the "New Adam" who, because he "became obedient unto death, even death on a cross", makes amends superabundantly for the disobedience, of Adam. Furthermore many Fathers and Doctors of the Church have seen the woman announced in the "Proto-evangelium" as Mary, the mother of Christ, the "new Eve". Mary benefited first of all and uniquely from Christ's victory over sin: she was preserved from all stain of original sin and by a special grace of God committed no sin of any kind during her whole earthly life.
This text is under copyright; the cited paragraph is quoted for study, with a link to the full document. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.
Why Pitre cites it
The Catechism's statement that the Fathers saw the woman of the Protoevangelium as Mary, the new Eve, and that she was preserved from sin by the grace of Christ.
Notes
Vatican.va text spells it "Proto-evangelium" (hyphenated) with straight double quotes; key phrase otherwise verbatim. Footnote numbers 305–306 removed.