The only thing you can/could do is to give her information regarding the Domestic Violence hotline, shelters, and what abuse is and what it does. It is sad, I know....many women don't leave.The Verbally Abusive Relationship is the book which saved my life after 31 years of abuse. She might agree to read it; all you can do is give her the information.

You should know that abuse is literally brainwashing; it changes your perception of reality and is called "crazy-making" behavior.