That's ridiculous.
She herself said she needed a savior.
That means she knew she was a sinner, something that she would not be if she had no sin nature.
Besides, she had a human father, hence a sin nature. God could not have taken away her sin nature and had her still be fully human to the point that Jesus shared in our humanity through her.
If it indeed happened as the RCC, then she never sinned and in that case, never needed a savior.
And if God could do it and did do it for her, why not the rest of mankind?
It would have saved the world a lot of grief.
Gods Grace prevented her from sinning. He saved her.
Then she had no free will
That means she knew she was a sinner, something that she would not be if she had no sin nature.
As I said, the only way to take away sin is through the penalty of death, which Jesus took on our behalf.
Some people have an obsessive need to worship a goddess.