It may have been a true accident??? Lots of times Jimmy does things that he says he does not remember, maybe he does not, but mostly I think he says that to not get into trouble. When he was younger he use to hit his head against the wall sometimes, but honestly I think it was more soothing than harming himself. Watch her, make sure she is using things properly and not just experimenting with things, kids will be kids even AS children.....Change is hard, hopefully when she gets use to the new school things will calm down, had a hard time with that as well, took us almost a yr for him to get use to the new school and finally except it and do well there, even though he had a horrible time at the old school...Hang in there I know it is so emotionally draining....Good luck!