So the theory is that thoughts-feelings-behavior all influence each other. If you change one, the other ones could/should follow. If you find things that you actually enjoy, then your mood will improve. Or if you find that you become good at something, you develop a sense of mastery and a feeling of competence. Also, as you noticed while you are doing stuff, the rumination is less.

Personally I have never found that to be enough...especially if I perceive that there are real problems in my life as in I'm not depressed for no reason. If I solve one of those problems, l feel better. Other ways to feel better would be to change the way you think about some things...not just positive thinking, but actually changing the way that you look at an issue. And accepting that something is the way it is, can reduce anger. All easier said than done. But possible. If I were you, I'd give the behavioral thing a little longer and if it doesn't work go back and ask her what else she has.

Also medication is a possibility.