The Birth Date is a rough estimate. See the text for details.
Biography
Birth date is guess, based on sibling's birth date of 1851.
Sources
Plantagenet Roll of the Blood Royal by the Marquis of Ruvigny and Raineval. Published 1911 by Melville & Company, London. Mortimer-Percy volume, part one, P84.
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DNA Connections
It may be possible to confirm family relationships with Helen 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 Helen: