There was no way anyone could have predicted this.
I disagree completely and vehemently. Putting a fully-automatic weapon in the hands of a 9-year-old? And letting her fire it with no additional support? That's beyond dangerously insane and borderline suicidal. This result is not simply predictable - it's pretty much guaranteed. There is no physical way the body of a 9-y.o. can safely control that kind of recoil - none. It was a near certainty that the force would knock her off-line and into a dangerous direction, and she would not have had the instinct (or capability) to let off on the trigger when that happened.
Let me put it bluntly: the "instructor" died from his own stupidity and incompetence. He deserved it. He put that girl and everyone else at the range in mortal danger with what he did, and it's amazingly karmic that only he died as a result. Her parents should be investigated by CPS for doing something so irresponsible as well. the only person in this sad affair worthy of any sympathy is the girl herself - she'll have to live with the mess that idiot created for her, when absolutely none of it was her fault.