Probably trauma and fear of hak and the dragons and yoon getting hurt by anything she does
Well, they’re in a place where they can’t exactly meet how they could in the past. Yes, they’re powerful, but they can’t do what they want in the castle. They’re all separated from each other and can’t communicate too well because of tension that’s still remaining between the leaders, the king, and the soldiers in the castle. If they all meet up, it could be suspicious so all they’ve been doing is sneaking around the castle. Due to this lack of communication and tension, that’s likely why Yona has been losing her composure.
Sorry, this is getting frustrating to say the least. This fake “lack of communication leading to misunderstandings” is an overused plot trope, to create unnecessary tension and advance the storyline in so many stories. I expected more from this manga. At least one of the dragons can clearly get to Yona without being noticed, having Yona isolate herself from the group isn’t what this adventure has been building up to...
It’s not like Yona to act like “some scared little girl” even when she is exactly that. Girl, where is the confidence you’ve built up, where is that tough confident front you put on in the worst of situations, where is that trust you had in the dragons, Yoon, Hak. You solved everything as a team, what are you trying to accomplish out here all on your own?
What is happening to this story (╯°Д °)╯╧╧