Mary was a sinner, like us. She said so herself.
Luke 1:46-49 - "And Mary said: “ My soul magnifies the Lord, And my spirit has rejoiced in God my Savior. For He has regarded the lowly state of His maidservant; For behold, henceforth all generations will call me blessed. For He who is mighty has done great things for me, And holy is His name. And His mercy is on those who fear Him From generation to generation"
Col 1:12-14 - "He has delivered us from the power of darkness and conveyed us into the kingdom of the Son of His love, in whom we have redemption through His blood, the forgiveness of sins"
Mat 13:55-56 - "Is this not the carpenter’s son? Is not His mother called Mary? And His brothers James, Joses, Simon, and Judas? And His sisters, are they not all with us? Where then did this Man get all these things?” - Mary did conceive after the birth of Jesus (contrary to catholic beliefs)
Romans 3:23-24 : "For all have sinned and fall short of the glory of God, being justified freely by His grace through the redemption that is in Christ Jesus"
Luke 8:21 - "But He answered and said to them, “My mother and My brothers are these who hear the word of God and do it"
1 Timothy 2:5 - "For there is one God and one Mediator between God and men, the Man Christ Jesus"