If the purpose of her misbehavior was attention, then maybe mom can find time to give her the attention she needs. If the purpose was power, then the child is not feeling like she has any power so maybe she needs to be given more choices in her life. Like let her pick what vegetable she wants with her dinner. Give her choices. A lot. It is simple - mom gives her 2-3 options for just about anything. Kids eat this up. It makes them feel like they have some control over their life. But mom needs to come up with the options, and daughter can choose from the options mom came up with. Don't let the child come up with the options, though. That can create an even worse monster! Lol. Good luck. You all can do this. I have been successful doing this with children with profound autism. It can seem like it is not working at first. Just stick to your game plan. The results will freaking amaze you!