why does molly become disloyal to animalism?

Molly has no interest in the political changes on the farm, but she does have a problem with being labeled amongst the lower classes of animals that are expected to work for their extras. Molly is used to being pampered and given treats. When she realizes that it will take actual work, she becomes disloyal and leaves for a place where she'll be treated in the manner she's been accustomed to.