With all due respect, and with no personal malice intended – this is utter non-sense. It’s the essential equivalent of determinism, and reeks of Calvinistic theology on predestination, even if singularly applied toward Mary.
IF she had not sinned or even been touched by sin then she needed not to be SAVED from anything. She then becomes self sufficient of our own inherent (that is, self) righteousness before God. As such she would invalidates the whole purpose for the incarnation and the virgin birth.
No Mary was not saved before she sinned, as that would be no salvation at all. She was saved because she, like all of us born of Adam, was a sinner and needed the sinlessness of Christ to atone and be the premise for her reconciliation with God.