After Vanessa is rejected from the lunch table for the second time, she runs to the bathroom and into a stall. She puts her backpack on the floor and stands on the toilet seat to hide when she hears the other girls coming. One of the girls takes a picture of the bottom of Vanessa's stall with their camera phone. When the picture is shown later, you see Vanessa's backpack along with her feet clearly planted on the floor.
When Emily brings Vanessa the stuffed bear and the flowers, she hands the bear to Vanessa but when the scene cuts back to her, she's still holding it. Then the scene goes back to Vanessa and she too, is holding it.
School gets involved full stop.
The school would get involved if bullying takes place in school away from the school then its a different story its down to other sources.