Christine

It sounds to me like your daughter might be being bullied at school - the put down, exclusion, isolation kind of bullying that is hard to detect.

She could be reacting to your divorce,but I worry that her behavior seems more linked to her own school activities and circle of friends.

Have you talked to a friend of hers who you trust about how things are at school?

Some of the parents here know about bullying. I recall I posted a thread here on it and lots of people had experience with it.