I finally was able to convince my fiance to hop on the snowmobile with me and take a ride on the trails. She said it was not her favorite thing to do afterwards, but it was a success just getting her to sit on it.
Her brother hurt himself on a sled, ironically just like mine, many years ago and since then she has be very apprehensive to jump on one.
The next step is to get her to drive it. I think she will enjoy that even more, since she likes to be in control.