She was expecting this, and watches several of the attendees take their own versions of the vows required for the Fidelius charm before it falls on Inara to do the same.

Standing, Inara intones, "I hereby swear my loyalty to the members of this order, to protect their secrets as well as the secrecy of their collective goal. I recognize Sokka Aquam as Secret-Keeper and his power herein."

The most faint of acknowledging smiles at anyone who met her gaze, and Inara sits again.