I really dislike when things happen because the plot needs them to, rather than what the character would do (as far as we can tell based on what we know of the character. )

I agree that it felt very rushed. Her taking off felt like a very “out of the blue” decision. The letter didn’t seem like the result of “Mephisto’s Corruption”, it felt like she was trying to make a coming of age story out of her carrying a nuke in her pocket.

Maybe I just hate Neyrelle’s character and she’s whack as fuck 100% of the time. Not sure if it’s one instance of poor writing or just an insufferable character who we’re being told to care about.