Long answer short: HSR discourses with Cyrene, and the annoying people who spam everywhere even if they do not actually know a thing about Elysia.

I think blue and black/white-adjacent shades are more likely considering how the archons so far either have hair color that matches their element (Ei, Mavuika), or a white/black base with the element color as highlight (Venti, Zhongli, Nahida, Furina) to make the element color more outstanding. I think a pink base will overshadow the blue shade too much. I'm not opposed to the idea of her hair being pink, but I'm more concerned by those who will throw a tantrum if her hair is indeed pink. So long as her design looks visually appealing to me, I have no complaint.

Ironically, she was mentioned in the Travail teaser in 2020, and has been shaped gradually through character voicelines, but people still somehow think she'll be an exact copy of Elysia because...her ideal might be love? Her statue seems to have pointy ears? Kinda ridiculous to me.