One other thing you might want to consider is it might physiological in nature. She could be Hypothyroid. It can make them feel very bad and they don't know why. It also reeks havoc on the sex drive. My wife suffered from this for a couple of years before we figured it out. I like you have always been attentive and it hurts your feelings when coutless advances are turned down. My weeks used to be something like this:
I would try to initiate...I would here "in the morning" In the morning I would try....I would here "tonight"
This could go on several days. It had such a large impact on her that when she started to get her thyroid straightened out, we had sex and I commented that that was good and then I figured it out....she actually moved during it.
Seriously, if you love her talk to her, and check out some possible physical reasons for it.
TwinDad Me 39, W 36, M 11 W - MLC, WAW???? 2 Kids B/G 3 YRS Old Start of the Long and Bumpy Road..... On the verge of piecing.....a new beginning