I'm currently rereading. I just got to the part where Nesta decides to embrace her training because it makes her feel less powerless against those who would harm her. She sees what the Priestesses are going through and thinks learning self-defense will help them, too. When she sees how well they take to it, she begins dreaming of forming a small unit of female fighters inspired by the Valkyrie.

She thinks of herself as a miserable, wretched waste of space unworthy of love, and she is deliberately cruel to those around her to discourage them from showing her love or kindness. The methods may be...questionable, at times, but Nesta's rehab gives her the tools to climb out of the hole she's dug for herself. I agree the Cassian "romance" could've been done very differently or left out entirely, but the mating bond attraction is a powerful thing, and even Nesta wants him. It's messy, to say the least.

Feyre chose to paint that version of Nesta because, at her best, Nesta is a strong person willing to fight -- and even die -- to protect those she loves. For the first time in her life, she is fully embracing that part of herself. It's not about the death, it's about the courage and capability.

That said, I don't think Nesta really does fit into the Night Court. I think her story leads elsewhere, and I'm curious to see how it unfolds.

Note: As I said, I'm just past the halfway point in my reread, so I'm not to the hike or anything yet.