Put the murderous bitch in an isolation cell at the sheriff's department and just "forget" to give her any food and water or check up on her until 30 days have passed...
It is the easiest way to save the taxpayers' money, keep this shit from going to trial and take up the judge/jury's valuable time, AND punish the piece of shit for what she had done.
No spectacular and highly controversial forms of justice, ie., burning, brazen bull, beheading, etc.. necessary for cases that wrench the heart strings. Simply lock up alive and forget.... That is more horrific to the recipient than any other method listed. The Normans perfected it to an art form and William the Conqueror brought it into England with his invading force. The Tower of London, with it's walled niches, is still a stark reminder of the brutal and efficient Norman justice system. All of the grand imperial Chinese dynasties from remote antiquity right up to the last feudal states in 1948 used it for especially brutal criminal cases. This penalty was only discontinued under the Communist Party because they opted instead for "shoot, shovel, and forget".