She can provide not only the initial details (the underground parts outside the Shield Maze have giant insects and such, but these should be trivial to Darth Occlus) but also a detailed description of the Shield Maze's layout, noting various important parts to it ("they were planning an expansion in that direction with called Earth Elementals so I don't know the exact details on that part if they finished", "the main chamber is where ceremonies with Neathers being inducted were performed", "I was never allowed into that room, and it is likely trapped, the cult has at least a bit of occasional infighting and people ready to challenge Hosilla is she showed weakness").
She'll also note the number of unique faces she saw (there are quite a bit more than gathered to attack the Wardstone, but most of them are likely operating in the city above). None of the other cultists were more powerful than Hosilla unless someone totally new is at the Shield Maze.