I've just gave the undead ash-khan his Cursed Crown, and everyone in the Ushu-Kur mine is back to normal. I gave Gelvu Andas the letter with orders to shut down the mine.

Now, as a greeting she says "You'd better do as my cousin says, sellsword. Find the Cursed Crown of Ushu-Dimmu".

Asked about 'orders' she says 'Go to Andothren and report to Tholer Andas about what we found here. Tell him about newly discovered burial chamber' (very old news now)

'no patience for incompetence' she says 'My noble cousin expects results from me. In turn, I must also expect results from you' (maybe acceptable, but I don't think she has anything to expect from me anymore)

I don't know what happens after the questline is completely finished.

And also I've just found out that Tholer Andas is back in his manor and his dialog is not changed either. He still thinks the Crown is a true prize, like in 'expand the mine' topic.