If she asks if she's doing something wrong, the subtext is: "Something is off here. I'm not enjoying myself. How do we fix this?"  

Rather than giving her a report card on her performance, get a little introspective. Tell her she's great, and ask her if there's anything you can do to make her feel better. Then, adjust your techinique accordingly. Even some of the greatest strategies don't always work in the field. There is no shame in switching your game up.