Mary Aubrey/Albeary (Allbury) - Parentage of Mary Allbury

Even if Mary Allbury is considered a daughter of Frederick, Prince of Wales [& I don't know enough to make a judgement on that matter], why has she been added as a daughter of Margaret Saunders? There seems to be no claim at all about who her mother was at all & no reason or evidence at all to think it was Margaret Saunders. There is actually no evidence that Margaret Saunders ever had a relationship with the Prince, much less was the mother of Mary.
Margaret did have a son Charles Marsack, but he was the son of her husband Charles Marsack [there is no contemporary evidence otherwise]. She also had children with her second husband John Houlcroft/Holfcroft.

Can Margaret Saunders be removed as the mother of Mary Albury please? Unless there is any evidence that she is the mother of Mary?

Thank you,
Jenny