From previous articles, the student should never have even been allowed to be in a position to shoot her (not that any student should, but this student was flying red flags and the district knew and ignored them).

Also, if I recall my understanding of workers comp law, if you have a "workplace injury" you cannot legally sue the district. If she is allowed to sue, which she should be able to, she can claim that they were negligent. I'd imagine some sort of liability insurance would kick in. If it falls under workplace injury, she can only ask for them to cover her medical bills, and they can also force her to start going to their shitty workman's comp doctors for any further care she needs.