And he also chose to save her from all Sin at the moment of her conception. HAIL MARY FULL OF GRACE.
You have absolutely nothing to verify this statement.
So you are correct Richard while you nor anyone else knows the MIND of God we do know what he reveals to us through the Church that he appeared to on the day of Pentecost. Which is the RCC.
Rom.8:3For what the law could not do, in that it was weak through the flesh, God sending his own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh:
Jesus came in the likeness of sinful flesh. The sinful flesh He came in the likeness of was Mary’s sinful flesh.
Rom.3
21But now the righteousness of God without the law is manifested, being witnessed by the law and the prophets;
22Even the righteousness of God which is by faith of Jesus Christ unto all and upon all them that believe: for there is no difference:
23For all have sinned, and come short of the glory of God;
24Being justified freely by his grace through the redemption that is in Christ Jesus:
25Whom God hath set forth to be a propitiation through faith in his blood, to declare his righteousness for the remission of sins that are past, through the forbearance of God;
26To declare, I say, at this time his righteousness: that he might be just, and the justifier of him which believeth in Jesus.
The righteousness of Christ is imparted by the gift of grace through faith in the remission of sins. If Mary was concieved without sin and never sinned in her life. She had no need of faith in Christs atoning sacrifice and therefore could not be full of grace as the angel said.
With that said it is revealed to the Church that Mary is FULL OF GRACE, so that means there is no sin.
Rom.5
8But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us.
9Much more then, being now justified by his blood, we shall be saved from wrath through him.
10For if, when we were enemies, we were reconciled to God by the death of his Son, much more, being reconciled, we shall be saved by his life.
If she had no sin Christ did not die for her. She is not justified by His blood and she is not reconciled by the death of her son, therefore she could not be full of grace.
Are you full of God’s Grace Richard?
Yes.
Yes
God choose to save Mary from any kind of Sin so that she would be Spotless and Pure for the SOn of Man to enter into her womb.
God chose to save us all from our sins even His mother by the blood of His Son.
Richard why would God not do this?

Why does it shock you so?
Why would He do it? I’m not shocked. Just a little tired.