FWIW, if it's a lack of physical desire, she should have her testosterone levels checked. This was my problem but I didn't know it because I had been that way for over a decade so it didn't occur to me that it should be any different. I know xBF was unsatisfied with the low frequency of ML but I just wasn't interested. With me it was because I was taking birth control pills. As soon as I stopped taking them my libido went way up. Of course this was during xBF's affair and I had to deal with that in addition to my new heightened level of desire so I went back on the bc pills to remove one element of the sitch.
Anyway, just tuck the info away until you get to a point where she's ready to reconnect with you.
If you love somebody, set them free. http://tinyurl.com/2empx2g