Need Advise

I need some help or advise please. My sister has a severe traumatic brain injury. She was in a near fatal car accident in 2003. Just recently she has been acting out of control. She is showing no respect to me or my mother. Calling us filthy names, screaming, etc. We will be having a normal conversation with her and if she hears something she doesn't like or something doesn't go her way she snaps into a fit of rage. Last night we had another "episode" and this time she became violent and physically hit me. I don't know what to do anymore and I don't know how to help her. You can't talk about it after the "episode" happens or it refuels the fire and we start all over again. We usually ignore the outburst when it happens or casually change the subject to get her mind off of what has made her upset but it is no longer working and I am at a loss. If anyone has any advise or help or knows a group or doctor in cincinnati ohio that would be great. Thank you for listening to me.