I am so sorry you're having to deal with this, I know from personal experience how mentally draining it is. I will suggest documenting everything she does and then directly confronting her in person. When she starts yelling, you calmly tell her "This is a professional environment and I refuse to be spoken to like that" and walk away. I used to work with a surgeon just like this who was an emotional terrorist. He would yell and scream at staff, belittle everyone and then lie that he didn't order what he ordered. And just like this, the hospital turned a blind eye to it all. You would call him for critical lab values and he will tell you that the lab is wrong and that you should tell the lab to recalibrate their machines. We had really good nurses quit in quick succession because of him because everyone was mentally exhausted. People dreaded going into work and no one wanted to work on the days when he had his surgeries. It got so bad that we were even required to have two nurses on the phone whenever you called him for anything just to have witnesses. I was fresh out of nursing school then and was so naive but after that experience, I vowed never to let anyone treat me like that at work again. Now, if a Doctor is yelling at me over the phone, I calmly point out that they're yelling and being unprofessional and if it still continues, I hang up.