We have 8-year-old twins. Over the past few months, one of them has become more moody and disrespectful at home. I was surprised to find out that she has also not been acting as well at school (talking when she's not supposed to). Today the teacher warned her EIGHT TIMES and when my daughter was caught playing rock, paper scissors at the end of a math test (most of the students were still taking the test), the teacher told her to move her clip. My daughter tried to argue with her. This is VERY unlike my daughter. The teacher called me to let me know what happened (we have a good relationship) so I made my daughter sit on her bed after dinner and do nothing for an hour except write a letter of apology to her teacher. Any thoughts on how we can turn this behavior around?