Why did Eve sin and Mary didn't?

I need clarification please. Mary never sinned and was incapable of sinning because she was immaculately conceived. How then did Eve come to sin when she was created the same way (free of original sin)?

Adam & Eve had no Original Sin and stilled sinned. Lucifer was an angel and still sinned. It is not simply Original Sin that leads to sin, it is an act of the will. Mary still had to freely cooperate with God’s grace.

The short answer as to why Eve sinned and Mary didn’t is that Mary made better use of God’s grace than Eve did.

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