please tell me you've bought her a decent set of leathers ... 
We bought her a nice Jacket, helmet, gloves, and a 2007 Ninja 250. We rode for a while but she never really felt comfortable on the bike. Too many years of her parents telling her how deadly they are and she would die on one. One day we were riding through our neighborhood on the way to meet some friends to go riding and she made a mistake around a curve. She layed the bike over at about 30mph and slid into the grass off the road. I saw he in my sideview mirror and almost wrecked my bike trying to stop and get back to her. It was a minor fall and she was not injured (just a few scratches and bruises). From then on she still wanted to ride but I decided her head was not into it and she was going to make a mistake and kill herself. I sold her bike shortly after and she hasn't rode since that day. I sold my bike about 6 months later as it got too hot in the summer time and its boring in florida with flat roads with no turns. Now she wants a can-am spyder. She says she would be much more comfortable on that. I will probably buy her one and me a new bike when we move to Colorado in a few years.
