@dinoleash: Many women who are in abusive relationships feel the same way that your friend does. They are blamed for every problem and usually punished for it. Most women who are in these types of relationships feel as though they have done something wrong and should have to fix it. That is usually due to fear. They feel as though they must change themselves and accept that they are the problem.
I would suggest that your friend end the marriage. I know that is a lot easier said than done. Domestic violence is a big problem and many women are scared to tell anyone that they are being abused. Your friend definitely needs you by her side. There are many counseling services available for women in her situation. I’m sure she has low self-esteem, as well. Tell her that you will go with her for counseling so that she doesn’t have to go through the process alone.