I don’t normally like to photograph kids after they reach the age where they’re aware of the camera and what it does. They tend to respond too much to the camera. Too much or too little.
This is a fairly controlled smile. This is the face she was determined to present to the camera, and nothing I could do or say could crack that control. She’s a smart kid, stubborn as can be. But she wasn’t being stubborn out of mule-headed intransigence. She was being stubborn because it amused her. She made stubborn seem charming.