My advice is to try listening to most of what she says and saying "I understand how you feel" or if there is anything you can say "You're right" or "I agree" or "I'm sorry you feel that way" Arguing is not going to help the sitch. Angry people want to be understood. Angry people really want to be loved underneath it all. I think the secret of DB is that you can subtly influence others with a positive attitude without directly talking about "working on your M".
DBer since 2003 D - 3/24/09 GAL and DBing for myself