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<p>Certainly unpreventable by the teacher. If she hadn’t been caught, but instead got a “gasp” “C” on the test, could that have set her off? Certainly possible.</p>
<p>The parents and neighbors knew that she had some serious issues - she disappeared for 3 days and when she came back it was very tense. That seems like a warning sign for some serious issues. I don’t know if the parents did anything at that point and even if they did if it could have prevented this.</p>