My 3 year old daughter is a beautiful intelligent child who is generally very happy. But from nowhere she turns into the devil child. She screaches at me to shut up, tells me to go away, leave her alone, screams, shouts is totally uncontrolable. She has always been ok but this is driving me insane. She has busy days and is always kept occupied has friends, goes to nursery and play groups. Is it just a phase? the naughty step always works ok but when she goes totally over the top nothing works - any suggestions would be gratefully received.