Ask her about the door and the key
From Lord Of Utterdom
"I've come to inquire about two small doors I found locked in the Armory. What do you know of this?" You ask.
"Those?" She asks, reaching up to rub a finger at her chin. "Merely ports to the escape tunnels, should the castle ever be put under siege. They've never been used, and the locks are so old that I doubt they'd open even if we hadn't lost the key."
