Zilpha Napochi "Sefaya" Bartlett was Alabamos Coosada and a daughter of the Napochi Mi'ko. Sefaya (the Alabamo dialect form of Sehoy) was a common Creek name at that time. There is a portrait of her on her Find A Grave Memorial.
Even if illiterate, most white women in the Southern Colonies could at
least sign their names but she put an "X" in the Indian style. The name
Bartlett was borrowed from one of the British Indian Agents of the time-- James Bartlett, a close friend of the Napochi Mi'ko who adopted the name Bartlett (this was a common practice among Creeks).
Her older brother was Napochi Hadjo (also known as Tommy Bartlett) who took part in the assault on Fort Mims and was an implacable enemy of US expansion into Creek lands.
The Napochi Mi'ko is best described as the headman of Napochi (a minor chief sometimes called a cacique). Often known to have traveled to the Carolinas with friendly traders. Possible he took the name Benjamin, as indicated in the Will of Benjamin Bartlett in Darlington District, South Carolina that mentions a daughter Zilpha and a son Thomas.
Zilpha married Thomas Andrews and was the mother of seven of his children. Zilpha and Thomas migrated to Dale County, Alabama and are buried in the Windham Cemetery there, as is her brother, Thomas Bartlett. 
Place: Darlington, South Carolina, United States
↑ 1840 United States Federal Census Author: Ancestry.com Publication: Online publication - Provo, UT, USA: Ancestry.com Operations, Inc., 2010. Images reproduced by FamilySearch.Original data - Sixth Census of the United States, 1840. (NARA microfilm publication M704, 580 rolls). Records of the Bureau of the Census, Record G
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It may be possible to confirm family relationships with Zilpha Napochi by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share DNA with Zilpha Napochi: