Mr. Granger, Kaleb Wallace, and a school board member came to watch Mama teaching. What was the outcome and why? Was there any "hidden agenda"?

The men purposely came to watch Mama's lesson in order to find a reason to fire her. The outcome was the loss of her job. Their hidden agenda was exactly what they got.... Mama without a paycheck. They know that both of the Logan parents work other jobs to supplement their farming, as they cannot generate enough money through farming alone. Granger would like nothing more than the acquire the Logan land.