First Female Serial Killer?

Sometimes the most interesting stories are the ones we may never know that truth of.  Lavinia Fisher was purportedly the first convicted female serial killer in the United States, however, she was actually arrested on the charge of highway robbery. The story goes that Lavinia and her husband ran a hotel in about six miles outside of Charleston, South Carolina. Lavinia and her husband would quiz the people staying in their hotel to find out of they had money, or were expected anywhere. Lavinia would give the unwary travelers a sedative in their tea. Depending on the story they would either stab the sleeping visitor or drop them through a trap door under the bed. One night a John Peeples became suspicious of the questioning. He really did not like tea but the hostess was generous so he dumped it when she wasnt looking. When he went to bed he decided to watch the door from his chair in case they tried anything. He woke up to hearing the bed fall through the trap door, high tailed it out the window, and alerted the authorities. Fortunately or unfortunately their is no proof of almost any of this. Lavinia and her husband lived or at least met at some place with the same name as the hotel in their story. They were part of a gang and they assaulted a man named John Peeples at that place. Lavinia assaulted atleast one man choking him and smashing his head into a window. She was hanged for highway robbery as part of the gang in 1820. Just before being hanged it is reported that Lavinia yelled to the crowd "If any of you have a message for the devil, tell me now - for I will be meeting him soon" but the truth of these words, along with many other parts of the story are lost to history.