Missed One!

Lizzie Borden
The link purports to identify a list of the most famous killer females. The problem with such lists is that while they attempt to be all inclusive inevitably somebody is left off.
The Clinton Body Count refers to a conspiracy theory, parts of which have been advanced by Newsmax publisher Christopher Ruddy among others, that asserts that former U.S. President Bill Clinton and his wife Hillary Clinton have assassinated fifty or more of their associates.[1][2][3] Such accusations have been around at least since the 1990s,

Hillary easily surpasses Lizzie Borden, Kathleen Wuornos and Elizabeth Smart, when it comes to body count.

I don’t know if Hillary commissioned any hits. I think it is more probable that people that had an ownership interest in Bill and her acted to protect their investment.