She's the avatar of Dana Méadbh, and she's regarded as the Wise One and a prophetess by the villagers.
She appeared in the short story The Edge of the World.
|“||[...] led by a fair-haired and painfully thin teenage girl.
She was older than he had initially thought - her delicate figure had deceived him, so different from the robust build of the other girls in the village.
Lille didn't lower her eyes. They were pale and wildly blue.
In the episode 7, Dolina Kwiatów, of The Hexer TV series, Lille was played by Małgorzata Lipmann.