Mary was made perfect by God, who knew that she would say yes to Him, for He knows all things from the beginning to the end. So, before she was conceived, God perfected her in preparation for the mission she would agree to. It was her faith and love for Him that led to that yes, and knowing it, He gave her what she needed to bear His Word.
Could you provide me with scriptural reference for this? If I am to believe a doctrinal issue it must be clear to me from the Word of God not the words of men.
I do believe that Mary was sinless when she conceived Jesus (her sins were forgiven). The old convenant provided a way for Mary to be forgiven of her sins. However, I don’t believe that Mary never sinned. The Bible contradicts this claim and you have provided no Biblical reference to support it. Only your words.