Lady Macbeth is pure evil. To what extent do you agree?

In Shakespeare's "Macbeth", we see a lot of evil; we see evil people and we see evil acts. We can see that - almost - everyone has an evil desire within them. However, only a really evil person acts on that impulse and commits something morally wrong. An evil deed doesn't necessarily mean an evil soul; Lady Macbeth was not naturally evil. Before her and her husband came to the conclusion of killing, they had …

…is presented with the opportunity to kill Duncan, she backs out saying, 'had he not resembled my father as he slept, I had done't'. Lady Macbeth tries to spiritually, mentally, and physically do what will please herself, and this inevitably ends up in her tragic suicide. If her mind was in such a state of turmoil then how could she possibly be branded as pure evil? The reality is that she couldn't be pure evil.