Mabel Peat was born in Hopkinton, NY about 1897 to parents William and Jane (aka Jennie) Peat. Her brother Rafel was born one year later.
Spelling of family name in Census records varies: Peet, Peat.
By age 14 (1910) Mabel is no longer cited in Census residing with parents. 
1900 CENSUS: Mabel Peet, age 2, residence Hopkinton, NY, daughter of William Pete, a farm laborer, and Jennie Pete. Both parents born in New York. Paternal grandparents born in Canada. Brother: Rathel Pete, age 3
1910 Census: Same household but Mabel is not present.
I've searched for but not found death record. (Ryder-1228 17:55, 29 October 2017 (EDT))
↑ 1910 Residence William and Jane Peat, son Rafel age 13, son Thomas age 8, daughter Mildred age 5."United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M54S-2ZZ : accessed 21 October 2017), William Peat, Hopkinton, Saint Lawrence, New York, United States; citing enumeration district (ED) ED 133, sheet 12B, family 288, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1074; FHL microfilm 1,375,087.
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It may be possible to confirm family relationships with Mabel by comparing test results with other carriers of her ancestors' 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 some percentage of DNA with Mabel: