She's rarely ever bites any more, but she does give me some very sour (hence her name ;D) looks. On occasion though, she will revert back to her 'old ways' and decide that she'd prefer not to do something. She'll then snap at me or aim her butt at me. And you know what I do? I make her think that she's going to DIE. The last time she tried to bite me, it was because she didn't want me to pick up her foot. She grabbed my jacket, not my arm, thankfully, but got the same reaction. She hadn't even released my arm before I had whacked her so hard in the face that her head snapped back. I then preceded to chase her around her pen until she was breathing like a race horse, calmly walked up to her, and picked up all four of her feet again. Then I left.
Its all about timing though. If you do it too late, the animal will not understand why you're hitting them.