My Butter girl is like that. The first few days she was really laid back and then all of a sudden it was like she did a complete 180; one time I lifted her hide up to check on her and she stood up like she thought she was a cobra I've found that leaving her alone and feeding her every 3-4 days(she has an incredible feeding response) is really helping to keep her calm-ish, but that 4th day can be a bit scary if she hasn't eaten and I need to clean her tub. I've not been bitten, yet, but she did catch a glancing blow to my thumb once and I hardly felt it. I am a little afraid that if she ever got ahold of me she'd never let go(like a dog with a bone, or so they say) so I try and stay clear if at all possible. I can't wait until she grows out of it, she's really to pretty to have such a bad attitude