Mary was a sinner the same as me. She is not devine. And has no power to forgive sins or provide salvation.
The idea that Mary was a sinner is not in the scripture. Indeed she is not divine, not a priest, and not a savior.
23For all have sinned, and come short of the glory of God;
Again in Romans 5:12 Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned:
More importantly Mary herself in Luke 1: 46 And Mary said, My soul doth magnify the Lord, 47And my spirit hath rejoiced in God my Saviour.
Savior from what? There is only one thing she could be saved from-SIN.