Mary was not saved from committing a sin. Mary committed many sins, as all humans do, and as God’s word plainly says.
If it were possible for a human to live a sinless life, there would have been no reason for our Lord to have suffered and die on the cross. (”there is none righteous, no not one”)
The scripture does not record any. It does, however, mention a penalty for laying baseless accusations.
If it were possible for a human to live a sinless life, there would have been no reason for our Lord to have suffered and die on the cross.
That doesn't follow. If there had been one sinner, and the rest were righteous, the salvation of that single sinner would have been sufficient for Jesus to die for him alone (see the discourse on the one lost sheep in the Gospel).