The Terrible Twos

So Kira has been going through this phase for the last several weeks where she is just horrible. I don't know if it's the age or she is finally realizing she's not the center of the universe now that the baby is here, but I keep wondering what happened to my sweet little girl! I have tried everything to keep my cool when she starts screaming, kicking, biting, spitting (yes, spitting) but nothing seems to work anymore, so if anyone else has any ideas on how to deal with my sweet little angel please let me know!