It may be possible to confirm family relationships with Hannah 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 Hannah:
I think Sarah and Hannah are the same person and the baptism record got the name wrong. In the original handwritten record Hannah could have been "Hanah" and looked like "Sarah". The records for this family are otherwise quite good so I don't see how Hannah could be born but not baptized and Sarah baptized by not born. Also in "Henry R. Stiles (1904) Ancient Families of Wethersfield, Connecticut, Vol. 2. p 717", this baptism date is given for Hannah and there is no mention of a child Sarah. The profiles should be merged.