As a member of the Elf Royal Family, in the eyes of the Elf Elder, all elves born without receiving the blessing of the Elf Forest are not purebred elves but mixed-blood elves.
Even if the child was born from two pure-blood elves, it is still considered mixed-blood.
This is called the Forest Bloodline Theory.
As for elves and other races giving birth to offspring and then participating in the Elf Forest's birth blessing... the Elf Elder will treat this as provocation and admonish the questioner.
Upon discovering Hilia is a 'mixed-blood elf,' the Elf Elder's gaze revealed some subtle changes.
She saw Hilia engrossed in purification, seemingly unaware of her presence, pondered for a moment, decided not to disturb, and quietly left, returning to Elina's side.
"How is it, are they from the Holy Court?"
