I got a divorce after 31 years of verbal and physical abuse; it was such a struggle to leave. The book that saved my life: The Verbally Abusive Relationship by Patricia Evans. All you can do for your friend is share your experience and give her some tools to help her. If you have a conversation with her, you could ask if she wants to leave, and how what is happening to her is affecting her. If you share your story, she will know that you understand and I am sure that will be a relief.If she feels understood, she might open up about what is happening ...and you can ask some good questions.