If there's one thing that Kaliyah learned as a Spook, it's that you get the first impressions of your target before they get yours. Facing off against an opponent without knowing what they're capable of is an easy way to get yourself trapped, as anything as small as a dagger could prove to be your downfall if you don't know about it. Hence why Kaliyah had infiltrated the Farron Keep. Well, not quite infiltrate. That would imply she was intruding. No, she simply made sure to keep a low profile, blending in with the other acolytes and servants as if she's suppose to be there, yet beneath notice. Many people would dismiss insects as being weak and lowly, but Kaliyah knew all too well what sort of dangers mere insects could bring. Being such small creatures allowed them to deliver their poisons to even the strongest of giants.

AS for why Kaliyah insisted on such subterfuge, it was simply habit. It wasn't as if she suspected that the Abyss Watchers were going to deny her, or try to kill her on the spot. They shouldn't be the ones to judge her sins, knowing fully well that the Abyss Watchers had spread more blood these past few days then Kaliyah had in her entire life. Some of them were even guilty. As for the girl, she watched the others from a hidden but high position. Should any hostilities occur, she could easily shoot down foes from above, or use her spell to dive onto an enemy without harming herself in the process. Worse comes to worse, someone spots her and calls Kaliyah out. She was certain that the commander or someone else of high authority would most likely do that; Kaliyah herself wasn't quite hiding herself so much as continuing to maintain a low profile. A sort of test, as it were, to see who among the new recruits could tell who does and doesn't belong. A test for Kaliyah to see who was observant and who was subservient.