For all have sinned, and come short of the glory of God; (Romans 3:23)
Either all means ALL, or it doesn't.
By the which will we are sanctified through the offering of the body of Jesus Christ once [for all]. - Hebrews 10:10
Again, either the sacrifice is for all, or it is not. This verse also denies the existence of any kind of purgatory. Christ's sacrifice was perfect and enough to save all (even Mary) from sin.
Mary refers to herself as the 'handmaid of the Lord' (Luke 1:38). Were Mary sinless, she would not be the Lord's handmaid; she would be His equal. Being human, that is not possible.
The Bible does not list Mary's sins. That does not mean she is sinless. In fact, Paul's words indict the entire human race.
OK...you know WAY more than ANY Saint that has ever lived!! Bowing to your holy intellect.
Where do you get the idea that "sinless" equals "divine"? Adam and Eve were created sinless and remained so until the Fall -- does this mean they were equal to God until then and only then became human?