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Yes, Mary already knew that she was saved. This was BEFORE our Lord offered salvation to the rest of mankind. The Blessed Mother didn't know that she would be saved, she knew that she already was.

Abraham also knew he was saved prior to Christ's salvation being offered to the rest of mankind, God declared him "righteous". The entire OT points directly to salvation through a Savior and Jewish followers who had faith in this promise were also "full of grace". Mary knew she needed a savior and she knew Jesus was her savior. Had she been "sinless", where was a savior needed?

Yes, Mary already knew that she was saved. This was BEFORE our Lord offered salvation to the rest of mankind. The Blessed Mother didn't know that she would be saved, she knew that she already was.

Abraham also knew he was saved prior to Christ's salvation being offered to the rest of mankind, God declared him "righteous".

That's why he's the Lamb slain from the foundations of the earth. He died at one point in time to cover all points in time.