I was a somewhat proficient high school runner - 4:08 mile - who never got injured because, well, I think my form was naturally pretty good, and we did Igloi training - intense but never really over 40 miles a week. Longer runs at a slower, comfortable pace would have really helped me and I wasn't going to get slow doing so - I ran 52 seconds for 400 as 105 pound ninth grader on virtually no training.
In hindsight I wish I had adopted far more of a Van Aaken method towards training in high school and beyond - focusing on a balanced, healthy lifestyle and cardiovascular capability as much as anything else. And this from someone who never had a running injury in high school or NCAA Division 1 - the injury I obtained through an awful attempt at pole vaulting doesn't count. Van Aaken's attention to health and diet - especially if presented to a suburban kid with no habits or parental direction - would have done wonders for me.
It is difficult to comment on the training of this young woman, but she is such a talent, if I were her coach, I would really be conscientious about not over-training. She has plenty of time to really train hard as she gets older - running is not swimming and takes much more patience. In this vein, perhaps this injury could have long term salutary impact.