Such was the case of the orphan servant girl, Mary Clifford.
When the Foundling Hospital (more on that later) opened it's doors to the orphans in London, it did so with the idea of teaching and reformation, in order to better society. Children would be apprenticed when they reached the appropriate age so that they could learn skills that would earn them a living. So that is how Mary Clifford and Mary Mitchell came to be in the service of Elizabeth Brownrigg as domestic servants.
Elizabeth had a good reputation as a working class woman. She was a respected midwife and her husband a successful plumber. Because of this she was chosen to overseen children training to be servants. One day the Foundling Hospital found a girl on their doorstep who they had entrusted to Elizabeth's care. She was frightened and had run away from her employer, complaining of abuse. After a medical examination the Governors found the girl was telling the truth and issued a warning to Elizabeth's husband, that if he didn't curtail his wife's violence upon her servants they would be forced to take action.
Shortly afterward a man was reading about the case in the newspaper when he realized his latest lodgers matched the description of Elizabeth and her son. He immediately contacted the constable and the Brownriggs were sent back to London to be brought to justice. The two Mr. Brownriggs were found guilty of misdemeanors and sentenced to six months in prison. Elizabeth did not get off so easy and was sentenced to death for her crimes of torture and murder. She was hanged at Tyburn and her body dissected for science (just as this Hogarth print shows, crime gets your body dedicated to science) and her skeleton was hung on display in the Surgeon's Hall as a reminder of the justice system.