How much is she mirroring you and your behaviour and issues? Sleep is one of the most important things in regulating mood. Get that sorted and you might see improvements in daily life. How is her diet and exercise routine? If she cant sleep is she doing enough physical exercise? For children this can be a few hours a day of vigorous exercise, outdoors is preferable. Diet can have a huge impact on childrens behaviour. I have seen it for myself over and over again in my work, try cutting out ALL artificial colours and flavourings, stick to fresh healthy food, no packet crap. It will take months for her body to regulate itself again so dont expect miracles in the first few weeks.

Therapy is always a good thing. I wish I had done CBT as a younger teen, that really could have changed my life.

Goodluck, it is so so sad to see so many people on this forum with mentally ill children.