My 4.5 year old daughter have gradually been getting naughtier and naughtier from the age of 18 months. At first I assumed she was entering the terrible 2's but as she has gotten older she has really started to behave horribly. She answers back, throws tantrums, physically fights with her 6 year old sister and 18 month old brother and she has had me in tears on many occasions. This is also the case when she is with other people, although not to the same extent as she does with me. What signs should I be looking for with ADHD or am I really just over-exaggerating the issue. I need advice please.