My DD has always been sensitive, high needs, etc. But lately she has become SO defiant of us, and especially me. We've had huge meltdowns daily for the past week. She's started hitting, pushing, kicking me, yelling at me, telling me she wants me to leave, and is super mean to her little brother. We are kind of at our wit's end.

Has anyone else dealt with strong defiance, aggression, etc from your school-aged child? What helped you through it?