If your D is looking to stay focused on an individual sport, I will put in an additional plug for Triathlon. With her swimming background, she is over the biggest hurdle. There is a significant effort within USA triathlon to get younger ages involved and clubs/competition have grown tremendously at the collegiate level. I have seen “talent identification” events going on for younger ages at some of the tris I do. In my opinion, the diversity of training across 3 disciplines is the best thing about triathlon. You don’t get burnt out on any one of the three.