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"): Bertha Gifford (October 1872 – August 20, 1951) was a farmwife in rural Catawissa, Missouri during the early 1900s who was accused of murdering 17 members of the local community.
Relevant evidence: Yes