How did Isabella (Sojourner Truth) actually gain her freedom from slavery?

Master Dumont promised to free Isabella a year early. The law was going to free the slaves who were forty the next year. When the time to free her arrived, M. Dumont did not want Isabella to go. She planned and left anyway. She found a family not too far from Dumont who took her in and hired her. When Dumont came looking for her, Mr. Van Wagener paid twenty-five dollars for Isabella and her baby. Mr. Van Wagener was the first white man to tell Isabella not to call him master. He explained that the only master was God, not any man.