It's one answer. I would be wary of considering it the one answer, especially if it encourages you to think there's going to be one or two big events that you can find, resolve and then have a normal sex life after a sex-starved marriage.
Even if the process started with something that made her angry ten years ago, the effect of that event has now been developing over the years and a lot of other factors have developed in that time, guaranteed.
