“full of grace” would mean no sin within her.
You are using a modern translation of the Bible.
Full of grace means she is just like the rest of us saved people: a sinner saved by grace. No one born of a human father is sinless, period. “For ALL have sinned and come short of the Glory of God...” Romans 3:23 emphasis added. “As it is written, “There is none righteous, no not one.” Romans 3:10
This would, of necessity, confirm that Mary was, like everyone else, past and present, a SINNER. She was SAVED BY HIS GRACE, as are all who believe on the Name of Jesus. Past, present and future.