as said can work for some, you also have to give it more than a few months, it depends also if one has full time work as that can be somewhat problematic with time off, but if she is in work, has a decent boss, then i can't see them not allowing an hour a week say... tell her to give it a try,
i can see the mistakes i make and try and not do it again, of course that doesn't mean to say it always works, but you have it in your mind when going through a bad time, and remember just what you discussed, personally i preferred one to one time, not a group cbt.