Ooooh complementing you on the chicken and being in a good mood!!!! I think your wife is really trying to work through her personal depression. It's not an easy thing to do. I have relatives who suffer with mild depression and it's a challenge. And it does make a person much more vulnerable. I could be wrong, but I still think she probably has some hormonal issues. Please try not to take her bad moods personally, from what you've described, I think she's trying very hard.
There is no arriving, ever. It is all a continual becoming.