Nothing has been said of a school counselor's insight. You need to think back when it first began (disobedience) because if all is well on the home front, then the issues are with the students or the school's lack of control. There is only so much the forum may suggest for causes. As to punishment, the list must be complied of items or activities most used or demanded by the child. On next occurrence, inform her that things are always changing and what we do makes it happen. Maybe growing too fast is hurting her ability to talk to her parents so the cellular phone may be too much for her to handle and it will be taken away until she shows she is in control of her language and will behave respectfully. You could also suggest she get to earning an allowance by doing chores for things she needs. You have the idea, now take one precious thing away with each punishable incident. No headphones, remove the PC cord, take all her lipsticks, take away the clothing items she should not be wearing, etc. One item at a time and return them when she snaps out of the trouble she began at home.