Agree that she should of stayed.

Whenever that part comes around in Kuja's palace and you have to choose who stays behind, and who goes on the mission to Oelivert, I try and picture everything through Zidane's mind and whether Zidane would in canon take Dagger with him or he feels like she would be more safe and mentally stable in Kuja's palace jail prison.

I think Zidane knows that Kuja is a tricky btard and is going to play tricks and mind games with the party members that are going to be left behind, but taking Dagger on a mission could cause her so much more stress and trauma.

It doesn't make sense that somebody so traumatized should go on a mission to go straight to Kuja's lair.