In Animal Farm why are sugar and ribbons more important to Mollie then liberty?

Mollie would rather have her ribbons and sugar, rather than her dignity or her liberty. She sees ribbons and sugar as money for example, without the money (sugar and ribbons) she would become the troublesome girl (horse) she is without it. Mollie in the Soviet Union is describe as an upper class person, whom cares for nothing except her jewels and money (ribbons and sugar).