Immature games. She wants to hurt you in whatever way she can.

Thinking.......when you talk to her, Lis, are you talking condescendingly? Or, are you talking to her in an emotionless way? I'm trying to think of a way for her to stop baring her teeth around you and the kids in the house. Can you think of a way to respond to her that WON'T antagonize her? At least until you get into a family therapist, which you need to do ASAP, even it if is HERS.