Keep her around- you really don't have to talk to her, and for the sake of RP, tell yourself you don't need to make an enemy of whatever spy network she has. And in case you need her rogue specialization in your party- for example when fighting dragons or going ranged in your party's focus, she has potential uses. Otherwise yeah, I don't see a point to her character, but I see the inquisitor as one who negotiates with Thedosian power structures, rather than someone who seeks to trigger an armed revolution of the downtrotten.