Question: Name the American female serial killer, who after her arrest confessed to 33 murders, and who with only Lydia Sherman and a farmwife in rural Catawissa accused of murdering 17 members of the local community completes the trio of American female serial killers?
Sentence (from "Bertha Gifford"): Some consider her to be America's third female serial killer, behind Lydia Sherman and Jane Toppan.
Relevant evidence: Yes