>>1 There are people who have been beaten and/or abandoned by their parents when they were younger, yet they forgive them later in life. Some even say they still love their mom/dad even for what they did to them. Then there are others who grow to hate and never forgive nor love their parents again.
I don't think it's wrong for you to hate her, if that's how you feel right now. In time, you'll see how your feelings towards her change. But don't let your hate for her ruin your life more than she already did. Even if you don't forgive or love her anymore, at least try to move on and work for your future so you can create that happy family for yourself and your sister.
And if you are under 18, both you and your sister, then you can take legal action as NZPIEFACE (
>>4) said.