It's totally normal, and she's not evil.
Lots and lots of babies hit and scratch around that age -- she's not being "mean," she's just seeing what happens when she interacts with the world, like she does with everything else. She doesn't have the cognitive ability to understand that it hurts you yet.
My daughter went through a several-week pinching period right at eight months, when she would pinch while nursing hard enough to leave black-and-blue welts on my breasts. That was fun! She would grab my lower lip with her fingernails, and poke me in the eye.
And she hasn't become a serial killer, at least so far ...