You know. Without sin.
Being full of grace does not mean sinless.
Grace is given to sinners. Where sin abounds, grace much more abounds.
If Mary was all that graced, it was because she was a great sinner.
If Mary had no sin, she didn't need God's grace.
The notion that IF Mary was sinless, she did not need grace, or a Savior, is absolutely baseless.
Mary’s sinlessness was a result of grace. It was the result of the saving death of Jesus Christ.