It may be possible to confirm family relationships by comparing test results with Neridah or other carriers of her ancestors' mitochondrial DNA.
Mitochondrial DNA test-takers in the direct maternal line:
AncestryDNA Maternal Lineage (discontinued), Ancestry member nerriejoy
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Neridah:
AncestryDNA, GEDmatch A543808[compare], Ancestry member nerriejoy