There is no mention of Isabell in her mother's will. If she existed, she died as a child.
It is highly unlikely that Martha Price Dunham is the daughter of Isabella Price. The only documented children for her and William Wheeler are Benjamin and Elizabeth.
Sources
↑ Edmund West, comp.. Family Data Collection - Individual Records [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2000.
↑ Edmund West, comp.. Family Data Collection - Individual Records [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2000.[Birth1700; West River; MD]
Barnes, Robert W. Baltimore County Families, 1659-1759. Baltimore, MD: Genealogical Publishing Co., Inc., 1989.
WikiTree profile Price-1650 created through the import of The Family Tree.ged on Aug 30, 2011 by Faith Budynas.
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DNA Connections
It may be possible to confirm family relationships with Isabella 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 some percentage of DNA with Isabella:
Price-167 and Price-1650 appear to represent the same person because: The parents are the same. Here is her findagrave page if that helps determine which dates are correct and verify's husband.
https://www.findagrave.com/memorial/33481146/isabel-wheeler