“The one verse is the greeting of the angel to Mary, Hail, full of grace.”
And this is wrong. The Greek does not say “full of grace.”
“There was no original sin on her soul. She was, indeed, full of grace.”
She was as sinful as every human in all history. Only Christ was without sin. She was the recipient of God’s grace by being chosen to bear Messiah.
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The Greek word "kecharitomene" is a past-perfect participle. This means that the action was completed fully and perfectly in the past. The Virgin Mary was "graced" from all time, completely.
She was not sinless of her own volition - she received it through grace by virtue of her Son's sacrifice.