Wow. Just wow. It was greatly written, but I still stand by my opinion that you should take more time so the reader gets a more, personal attachment to the main character, instead of just reading about her.

This is a good opening chapter. I like the premise you came up with, and the idea of the father cutting Karen out of her mother at birth was creepy.
A couple things kind of rubbed me the wrong way though -- I know that the father was a terrible person, but wouldn't he have been scared of Karen? If he was hoping she was a witch, why would he terrorize her like that, when obviously she'd come back and kill him in the end?
Also, the pacing seemed a little off -- but that could very well just have been me.
In any case, I think with some work, you could really have a great thriller in your hands. I can't wait to read more.