My 14 yr old stepdaughter has been aggressive with me before, but its starting to get a lot worse. She blows up at me when she is asked to do something,and wont look me in the face when I'm trying to explain something to her.We have been in two physical situations in the last two weeks. The first time she had me pinned to the floor and the second time she threw me against a wall. Im at my whits end and don't know what to do. Any advice would be great! TIA!