Poor Princess Shireen?

Yes, she had her greyscale stopped, 'stopped' being the operative word here. She wasn't cured and still had the rough scales on her face, even after her father's (curse him) efforts to find a cure.
But from what I remember, he never talked about using the dragonglass at the castle as part of her treatment. I think that would have come up. Speculation I've read suggests that her incidental exposure to the dragonglass particles that would have surrounded her may have helped stop her disease.
Maybe it can cure Jorah, but if it doesn't do more than stop the progression of the disease, the make-up/prosthetics department are going to have their hands full turning Iain Glen into someone who has gone into the later stages of greyscale.
