The pretzel logic and mental gymnastics are coming from those who claim that someone who is sinless had a Savior to keep them from the sin they never committed.
And that pre-forgiven means that it keeps the person from sinning in the first place.
If there’s no sin, there’s no forgiveness and no grace.
Forgiveness and grace only kick in in the presence of sin.
Admitting Mary had sinned and was not sinless makes a whole lot of Scripture make sense, like how she could, by her own admission have a Savior, and how she could be graced by God.
BTW, since God was able to (allegedly) keep her from sin, then why doesn’t He do that for everyone who is a believer and save the world a lot of grief? It can’t be that hard, or too hard for Him, since He’s God.
Perhaps this topic is a bit too far off the subject of this particular thread. Continuing on a thread of its own would probably be more appropriate.