Help!my 7year old can be very well behaved and then suddenly turns and becomes a mild monster. She does not listen is rude ,answers back and does anything in her power to annoy .She becomes totally oblivious to everything around her apart from what she wants.She does unbelievable things without any thought of the consequences to herself and others, a lot of the time she is very good ,considerate and respectful and very loving. Her behaviour is not just at home but with her highly experianced childminder and at school.We are very careful with her diet and she seems to change on the few occassions she has chocolate and other odd items ,sometimes though it can happen on waking in the mornings. Despite her realising that it gets no response from us she seems to find it amusing.