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I think she's just doesn't really know how the heck to react as she's getting so much thrown at her at once and she can't really even go too much off of the novel at this point either, bc it hasn't even started and even just her being alive messes up how the novel was going to probably play out as well.
She's probably more so just sitting back with a drink watching as things go on, since she already has her backup plan to get away in place with those moon crystal things (I forgot the name of them ( ̄∇ ̄") ). So I think she's still trying to get a grasp of everything going on, while being comfortable with the fact she has a backup if she needs it basically.
Thougn even with all that, she is making like 0 decisions for herself as of yet. Like it's obvious how much her brothers care about her, they aren't just gonna cut your head off if you make them just the slightest bit upset (maybe a servant which is bad of course, but there's a way to work around that if you just cry a little and put up an act to get them to stop), you can run them hun, c'mon. ( ̄へ ̄)
I'm not judging since I only skimmed through the chapters but like... Isn't she a pushover? All throughout the chapters, she just let them push her to doing what they want. (Sure, her brother is a psycho and she's being cautious.) But like... She's just kinda like a sitting duck there