What Irulan said.

I hope this isn't entirely true, I don't really want it to be true, but most of what I've gotten out of years of therapy for double depression is that I'm not so much of a jerk as I used to be (at least I don't think I am ...). I don't know that I really feel any better inside myself, but I've tried to learn what behaviors are "normal" and appropriate and what ones aren't, and therapy has been really important with that. Maybe there's some way you can put it to her that way, I don't know because it doesn't sound all that appealing or worthwhile really, but somehow express that therapy could help her act better even if it doesn't help her feel better?