Louisa Merrifield, Poison Killer

There is an ongoing myth that if a woman wants to murder someone, she will use poison. These claims are partially true because 40% of killers who used poison are female. Surely, women do have more opportunities to administer the dangerous concoction to their victims because they are the caregivers. The women cook food, take care of a household, etc. And in the past, poison was simply laying around in forms of different cleaning agents and rodenticides...
The poisoners would often benefit from their victim's death, and this happened in the case of Louisa Merrifield, also known as the Blackpool Poisoner. She wanted to inherit a nice property in a wealthy part of the town, and Sarah Ricketts was in her way.