Please have her seek a therapist who can help her. She sounds like she really needs to get help but may not know how to really ask for it. You are a wonderful husband for sticking by her side and for searching for help. If she is in danger of herself or others you can get her help that she may not want for herself on her own. Couples therapy does sound like a good idea if it will make her feel more at ease that it is not her fault what she is going through but that it is a team fight on getting the help she and you need.