Which sport does she love more?? Some times kids just want to be kids and do sports, sometimes parents see the way to "success" and want to micromanage it. I would not focus on one sport more than the other merely at a chance for high level competition. But I am going to assume that is not the case here as I do not feel that is your style. Can she continue to do both sports just like she is now? Seems sad to give up gym for the other sport, unless the other sport is one that gymnastics contradicts in some way.