Before the fall of man, Adam and Eve were created free of any sin. In the end, they willing decide to God against God’s commandment by eating the fruit from the Tree of Acknowledge.
Jesus as we know is the New Adam and many Early Church Fathers often said that Mary is the New Eve because she undo Eve’s disobedience by Mary’s obedience to God’s will.
He became man by the Virgin, in order that the disobedience which proceeded from the serpent might receive its destruction in the same manner in which it derived its origin. For Eve, who was a virgin and undefiled, having conceived the word of the serpent, brought forth disobedience and death. But the Virgin Mary received faith and joy, when the angel Gabriel announced the good tidings to her that the Spirit of the Lord would come upon her, and the power of the Highest would overshadow her: wherefore also the Holy Thing begotten of her is the Son of God; and she replied, ‘Be it unto me according to thy word.’ And by her has He been born, to whom we have proved so many Scriptures refer, and by whom God destroys both the serpent and those angels and men who are like him; but works deliverance from death to those who repent of their wickedness and believe upon Him." Justin Martyr, Dialogue with Trypho, 100 (A.D. 155).
“[H]e was born of Mary the fair ewe.” Melito de Sardo, Easter Homily (c. A.D. 177).
“In accordance with this design, Mary the Virgin is found obedient, saying, ‘Behold the handmaid of the Lord; be it unto me according to thy word.’ But Eve was disobedient; for she did not obey when as yet she was a virgin. And even as she, having indeed a husband, Adam, but being nevertheless as yet a virgin (for in Paradise ‘they were both naked, and were not ashamed,’ inasmuch as they, having been created a short time previously, had no understanding of the procreation of children: for it was necessary that they should first come to adult age, and then multiply from that time onward), having become disobedient, was made the cause of death, both to herself and to the entire human race; so also did Mary, having a man betrothed [to her], and being nevertheless a virgin, by yielding obedience, become the cause of salvation, both to herself and the whole human race. And on this account does the law term a woman betrothed to a man, the wife of him who had betrothed her, although she was as yet a virgin; thus indicating the back-reference from Mary to Eve, because what is joined together could not otherwise be put asunder than by inversion of the process by which these bonds of union had arisen; s so that the former ties be cancelled by the latter, that the latter may set the former again at liberty… Wherefore also Luke, commencing the genealogy with the Lord, carried it back to Adam, indicating that it was He who regenerated them into the Gospel of life, and not they Him. And thus also it was that the knot of Eve’s disobedience was loosed by the obedience of Mary. For what the virgin Eve had bound fast through unbelief, this did the virgin Mary set free through faith.” Irenaeus, Against Heresies, 3:22 (A.D. 180).
“For whereas the Word of God was without flesh, He took upon Himself the holy flesh by the holy Virgin, and prepared a robe which He wove for Himself, like a bridegroom, in the sufferings of the cross, in order that by uniting His own power with our moral body, and by mixing the incorruptible with the corruptible, and the strong with the weak, He might save perishing man.” Hippolytus, Treatise on Christ and antiChrist, 4 (A.D. 200).