Just keep in mind that she may not be getting hit at all. It sounds like you know the drill very well, and it boils down to manipulation. If she is getting hit, I hope she has the ability to dial 911, go to a shelter, or get a restraining order.
Nobody needs to remain an addict unless they choose to.
Nobody needs to get hit unless they choose to allow it.
And I know. My exAH hit me many times before I finally said, "enough!"