"If I didn't know any better, I'd think you're on my side, Isabel."
—The Wizard to Isabel
Isabel was one of the most trusted members of the Wizard's Council. Her position seemed to be equal to Elizabeth's, as they were often shown walking together in unison.
As all Councilwomen, she was previously one of the Glinda's girls, handpicked to serve the Wizard by the Maiden of the Northern Light.
Unfortunately for her position, she gave in to the call of the flesh and became pregnant by one of the Wizard's guards. This resulted in her being revoked from the Council. Her place was taken by Anna.