Well you are both going through a transitional period right now. It doesn't sound like you emotionally repulse her, or even physically either. Perhaps just more that the passion isn't there for her as much, and this is not uncommon at all in a marriage of long duration. And she may have a much lower sex drive than you do as well.
It seems that perhaps again, as she is evolving she needs to see you in a new light. So, it's about rediscovering yourself in this process and shifting your focus to you, and less on her. Rather than wondering if her choice of reading may be affecting her, why not find a book that is interesting to you, and become engrossed in your interests.
I know it's easier said than done right now, but will help to rebuild an attraction in her for you. Also, show her a new version of you, one that is confident and interesting. Maybe after all these years she feels like she knows every last angle of you, so show her something new. Again, though it's more that you find yourself and she sees you then in that new light.
Another thought is that you could always ask her what she finds most romantic or what excites her the most sexually/intimately and have a discussion about that. you could always go see a couples counselor as well, even for a few sessions. There are also couples retreats available for weekends where you can go to rebuild connection and intimacy etc. You can google that couples retreats and see what you find in your area, etc. Again, hang on to YOU in this process and become stronger and grow from this.
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