Oh, this sounds excellent! Estelle is not a nerd in the slightest; she's an athletic tomboy, who loves fishing, sparring, and sports. She has a thing with a brand of Calderan shoes called Stregas.

She'd have trained with him -- maybe a lot, to try to help him catch up. She'll keep his secret, or at least try. Estelle's... impulsive. So she might slip up at some point. But she'll stick by him and try to help him as a fellow Seeker!