It's nice that you consulted and "Ethnic Studies" database. That's so "intersectional" of you to do.
The fact is that Lily's ancestors came from Asuturias in the north of the Iberian peninsula. Just ask her.
Fun facts: Asturias was the only region in Iberia that was never conquered by the subhuman muslim filth Jihadis. It was from Asturias that the "reconquista" of Iberia was launched to retake the land from the muslim subhumans. The population of Asturias, to this day, is primarily Gallic. That would be "Celtic" to those with a more nuanced understanding of these things.
That means Lily is Lily White and probably has more Celtic blood than I do, and I'm half Irish and Scot.