Tell her to get the hell out

"Now get out of my room, or I'll throw you out myself."

Spooked, the diviner gives up and runs for the exit, arms crossed over her formidable chest. Clearly she's learned very quickly she doesn't have a chance in hell to put up any resistance to you so she might as well get away while she is able.

You watch her ass disappear out the window, and when you go over to look see her sliding down the sloped roof onto a bale of hay. After dusting herself off and plucking bits of hay out of her hair, she runs over to the other two elves hiding in the shadow of the stables. You can see they exchange a few words, but can't hear much more than hear the diviner say something along the lines of "I don't want to talk about it. This. Never. Happened."

You don't feel bad for forcing them to run home naked, but you do feel a little bit bad for stealing what is clearly a powerful, precious item, so you throw the staff out the window and see it rolling down the rooftiles to clatter somewhere on the ground below. You're not much of a wizard anyway.