Moods come and go. We don't like it when our child is in a mood, but we deal with it. "This isn't like you. What else is going on here?" is a great way to start active listening her. If it's attitude or disrespect, confrontation and consequences may be in order. Symptoms, however, are more enduring and require more time and attention. The 6-8 week rule helps determine whether she is in a mood or has a symptom.