Meaning, she was not immaculately conceived. She was born into sin, as we all were. She needed a savior, as well all do. She died, as we all will.
Nope.
It's all explained in #38.
Mary was saved from Sin by God, just like the rest of us. In her case, it happened before she was made. Her creation was a very special event - completely and in every way as important as the creation of Adam and Eve.
Adam and Eve also had sanctifying grace from the moment of their creation. They were saved by God. They chose to throw it all away. Their sin has traumatized our existence. We just don't know what we would have been like - what the world would have been like - without the fact of Original Sin.
Mary also could have sinned. She could have chosen to say no to Christ. And in her case, saying no would have meant no Incarnation, no Eucharist, no Crucifixion, no Resurrection.
If Mary had sinned by refusing Christ I can't even think how bad that would have been, nor how God would have worked out our salvation if Mary had failed us - it would have been at least as bad as a second Original Sin.
Therefore the only way to appreciate Mary's position in history is to regard her as the Second Eve, with all the extraordinary magnitude of such a title. There is simply no point in worriting about her sinlessness as if she were merely another historical figure like Margaret Thatcher or Boudica. She was sinless because she was vital to the central event of reality: God became Man.