[maryz]

If Mary was full of Grace by herself, why would the LORD need to be with her?

How could she be "full of Grace" if He weren't?

[11th Commandment]

Exactly, her Grace is imputed from God, not by her own volition. So Mary sinned, but because of God's Grace, his imputed righteousness cleaned her Sin. If Folks want to say she is the "ultimate Christian" because she is "full of Grace", that doesn't dispute the fact it was because what God did, not what Mary did.