Perhaps depression won't let her change just yet.

I will tell you what it's like for me:

For a long time, (like, years) I had no desire to do anything and when I say that, I'm not exaggerating....everyone has a different experience with depression. Some are able to make the necessary changes required to stop from sinking too deep. Some just are too deep immediately....(me, totally). My husband had to make an appointment and take me to the doctor. I really, really couldn't do it.
My own treatment doesn't matter at this point....it's going pretty slow. But you can believe me when I was shocked at the suggestions made to me. They were absolutely correct, but at the time doing any of them were the equivalent (to me) of walking on water or sprouting wings and taking off. They COULD NOT have happened. And it wasn't anything monumental...it was more like telling me to sit in the sun or go for a walk.

I hope this gives you some insight as to what it's like for some of us. I hope you continue to read here and expand your view. I really hope that you are able to think of your wife above yourself.

Take care (and remember that YOU need to take care of yourself also so that you can help her)...