Total fluff piece. They don't even know how long she was doing the diet... 1 to 2 weeks? Maybe it was 1 day for all we know.

Most humans can eat nothing for 2 weeks and they won't suddenly collapse and die, particulary if they are a teenager. I'd be a litte more worried if they had said after 6 months on the diet this had happened.

Maybe she had done an extreme workout and then collapsed. One hears about that happening every once in awhile with people, even teens. Even if they are not on a low carb diet!