Ack! The terrible two's have lasted another two years! I think it's time for good and bad lessons, mainly explaining how bad hurts others and makes people sad. Instruct her to start thinking and imagining what good people do to make people happy and those good inspirations will start coming to her.
I'd hate to scare a four year old but have her sit through the evening news with you one night so that she understands what harm people do when they grow up to be bad.