Very similar to difficult child 1. I understand your being hesitant about medications for it. That may not be it.
She needs to learn coping mechanisms with or without medications however. Natural consequences. We will bring a forgotten item to school once per school year per child. difficult child 1 almost failed 7th grade due to this. But the fact is, they have to deal with it in the long run too. Also, difficult child 1 doesn't WANT to be organized. So we're working on that. With difficult child 2, it's just a struggle to remind him to put stuff in backpack, put backpack in the same place each night. Eventually it's a habit. We hope.