Want to give good marriage advice to friend.... ?

My best friend is having some problems in her marriage and I want to give her the best advice I can, but I'm just not real sure where to go with it. Her husband and her have been married for over 2 years and have a small child. Recently, they have been having major marriage problems. Her husband isn't very appreciatve of all she does and tends to like to argue. He knows what buttons of her to push and had admitted to me that when he does this she sometimes gets physical and hits him. It's just odd, because she is not a physical person, she is actually quite loving. I was with them New Years eve and on our ride home back to their house he yelled at her because she was a little tipsy...she got mad and slapped him in the car. When they got home he said he was tired of it and pretended to call the cops and have her arrested. She freaked out because she didn't want to be away from her son. It was very uncomfortable for me. I know they love each other very much, but don't want to put their child in an unstable relationship. What do you suggest I tell her?

Sit her down and suggest marraige counseling. It is really the best thing for them...