“Art is using your brain and hands/fingers and imagination -- so what is different about art from writing? Have you ever been told what to draw or paint, or is that always your choice?”
Because there are left and right- sides of the brain that have different functions. So the right side of the brain is more subjective, and the left side is more objective. Could it be possible that her right-side of the brain has taken over/doesn't work right? Maybe it is some kind of disorder? She can't control crying, so maybe it's possible?