Hmmm... well now, this is interesting...
There seem to be many possible explanations for Heronia's behaviour...
#1. She could be another isekai.
#2. Her BIRD could be an isekai, and is trying to guide her.
#3. She could still be remotely under command of someone back from the original world, where the game can't account for the changes wrought by the mad girl's antics... so she can only react to the original scenarios and not the changed versions...
On another note, I laughed so much this chapter. I think the funniest part was Kuro not understanding hiding.