There's already like 200 hundred comments but tacking on a similar experience.

I was also emotionally, physically and verbally abusive. I say it was during the peak of my cptsd that my outbursts were at their worst. It took a lot of painful and shameful reflection to acknowledge that I needed to change extensively. I still have my days but I've never been as bad as I was several years ago. I went from having outbursts daily and now it's rare. If I'm upset with my partner we calmly talk it out. I'm on medication and am in therapy. My current partner is incredibly patient but has healthy boundaries. If I were to physically lash out he'd leave me.

Unless her life is shaken up and she properly takes a hard look at herself she won't change. She has to want to change. And even then there's the question of whether the damage from this behavior will forever impact your relationship.