I wouldn't be surprised if they find out she had some type of undiagnosed brain condition and all it took was a small hit to loosen a clot or such like.
i havnt been skiing since i was like 13, but i started when i was 3 and was doing black diamonds by 7 or so... double blacks shortly after that. kids catch on really easy, plus with the shorter ski's when you're younger you can go through mogals and tree's like nobodies business.