I'm also wondering if hormones could be the problem? I'm never at my best the week before my period starts... feel irritable, bloated, sweaty, tired... (TMI, sorry! ). If not, there is definately something under her skin!
I wish I had some good advice for you, but I'm really just figuring out my own way here recently. I can tell you that when I'm P***ed off about one thing, and it may not be my H, I used to carry that anger around and it would seep into everything I did. I'm sure my H had no idea what was wrong, but he probably assumed it was something he did. It never solved the problem, but I would make the decision to be angry and wouldn't give up.
As for what would help... usually H would ignore me, and I'd get tired of being angry. I'm not sure if your W will get tired of it, but perhaps try to carry on as if you are not even aware of her mood, as if you are happy no matter what.
I'm of course no expert... just a LD woman trying to make the leap to HD, or at least MD(moderate drive!).
). If not, there is definately something under her skin! 
