If she wanted Kate dead she wouldn’t have to kidnap her, i am guessing she wants information more than anything, both about Phil and about the capabilities of FTR, which she will get from the rescue mission. It seems she has no intention on keeping Kate hostage, probably not Hue either, Hue while traitor is a known quantity, and again if she wanted to kill him he would be dead. Best case is that she agrees to arrange armistice periods in exchange for the chat
Now let’s hope the robes isn’t laced with poison ?