Sarah secretly taught Hetty, her personal enslaved girl, to read and write, but when her parents discovered the young tutor at work, the vehemence of her father's response proved alarming. He was furious and nearly had the young slave girl whipped. Fear of causing trouble for the slaves themselves prevented Sarah from undertaking such a task again. Years afterward, she reflected on the incident, writing "I took an almost malicious satisfaction in teaching my little waiting maid at night, when she was supposed to be occupied in combing and brushing my locks. The light was put out, the keyhole screened, and flat on our stomachs before the fire, with the spelling book under our eyes, we defied the laws of South Carolina."