Last season Edmunds won Junior Nationals.
Cesario, Hicks and Siraj competed in Seniors. All of them scored higher than Edmunds and USFS decided to send them and not her to Junior Worlds.
Reason #225435 for why all USFS officials should get whacked on both knees with a retractable police baton. (Where is Jeff Gillooly when you need him?)
If you look at BMI of competitive athletes in endurance sports and sports like figure skating or ski jumping where you should be as light as possible, it's going to be extremely low. But BMI was never meant to be used as a tool for individual diagnosis of a healthy weight. Body fat ratio is what you want to look at.