My rat is used to running around my apartment while I watch her. I used to be able to pick her up and put her back in her cage (which she shares with another rat that doesn't like to come out). Now she is becoming the boss of me, and when she starts to chew on something she shouldn't, like a door, and I try to pick her up and take her away, she squeals, squirms, and today she put her teeth around my finger. She used to be a sweet rat. How can I get her to be nice again?