About the only thing I can add to this is perhaps it's not ALL she wants but she's just getting less than she would like and so it's the focus of her mind.

Here is what I think. Have you thought of ways to please her without your own Libido or "body part" (for lack of a better term, without being blunt) ? I mean there are many ways to please a woman sexually that does not always involve intercourse. Just a thought. Maybe see if she's open to those options when you can't? After all if your goal is to make her happy I'd think you'd try to find other ways to give her some sexual satisfaction.