Have you considered planning part of trip to include her? maybe fly her to some place along your trip, so you can enjoy the place together for a few days. Take in some interesting sites there together.
My wife loves to bike, but doesn't like riding on the road, so touring is out with the exception of trail based tours. We had a wedding to go to in Iowa this past Summer, so I decided to ride back to Pittsburgh. I decided to skip Illinois due to time, so we drove to Indiana Dunes National Park, because my wife has a goal to see all of the National Parks, or as many as possible, and get her National Park passport stamped. We did photography there, a hobby we both share, then camped there, something else she wanted to do. The next day, she dropped me off in Chesterton, Indiana, and I began my ride. Halfway through my trip, she came to visit me and camp with me one night. We had a great time, and I was able to enjoy my tour, and share part of the adventure with my wife.