I agree to Dia in a part that she’s already grow up and she also have a mind on her own. She can decide for herself let her be. If she get hurt then be family to her, help her recover, cure her but don’t decide things for her. Kids won’t know what the best decision they should make for their selves if they wouldn’t make any wrong. Mistakes is made for a purpose and that is to learn from it and not to repeat it. And honestly Dia is already older than them they just treat her as a child before because of her physical body but her mind is already an adult. Dia’s mind just changed a little because even if she’s already a adult in her mind there’s a things she didn’t get to experience because her focus in on the war. But that doesn’t mean that she’s innocent like a newborn baby that doesn’t have mind of her own. I understand that they’re afraid but like I said before Dia won’t grow if they keep on locking her in a cage to stay as a child ,as their little sister, as their baby, as their third long lost child.