Why does Mollie run away from the farm in Animal Farm?

Mollie represents vanity. She is the people of a society who want nothing more than instant gratification and to have their needs met.

Napoleon didn't set things up for Mollie to have her needs met instantly. In fact, he took away everything that she wanted: ribbons in her hair, sugar tablets and most of all, favor of the leader. She had all these things with a human leader and longed to have it again, so she escaped from the farm.