THIS.
Did the school not have a guidance counselor or school therapist (even a visiting one who perhaps worked with the district or region)? ET is so obviously of a vulnerable makeup (new student coming from homeschooling background, parent with abuse allegations that no doubt everyone knew of) that I now have to wonder why she wasn't given counseling assistance pro-actively by school officials. These reports of adults, teachers at that, acting like teenage "mean girls" astounds. Even taking away the crime that actually wound up happening in this case, ostracizing an already troubled fifteen year-old who most likely has trust issues and possible depression/anxiety issues is a recipe for ruining that individual's life.