I was talking about it from a “spiritual sense”.
So .. Mary’s sins were “spiritual” - So were the sins of every other human being on the earth. Adam and Eve - after eating of the apple - DIED SPIRITUALLY. Therefore, Mary was not sinless (because no human born after the fall of Adam and Eve could be sinless) - it’s that simple.
Mary was pure in the sense that she had never been with a man .. because if she had, no blood would have been shed (by way of the breaking of the hyman). That act, of a husband and wife, is considered a covenant of marriage. Mary’s virginity was important for that reason; God was making a covenant with humanity .. plus, Mary not only believed in God, she loved and trusted Him.