i hear ya, pk, but i think this is a bit more complex. she moved here from another country, a popular boy at school took an interest in her, then out of jealousy other kids started calling her a slut, knocking books out of her arms while walking down the hall, pelting her with items as she walked home, canvasing internet social outlets with all kinds of insults, lies and stories about her. and this went on for months. that had to have been horrific. to a typical 15 year old girl who wants a boyfriend and be part of girl's group of friends to talk about other boys and things but instead is isolated from the social community and ridiculed by it, that in itself is a death sentence. to a 15 year old boy it means something else, like grab the nearest blunt instrument and start swinging. something i would have done.
i read in the new york times article on this that the school officials were aware of the bullying but did very little to stop it. i think you are spot on in your assessment of the school officials. they didn't even notify the girl's parents. and the time's article spoke of two other kids from that district who were moved to other districts because of the bullying. i would seriously hope that the community takes this as a sign that some changes need to be made in that district's education system.
also here's yet another example of parents creating monsters that harm other children. it's a modern day Frankenstein story