Of course she hasn't forgotten Iman's extraordinary benevolence even once she'd accidentally revealed her true appearance for a moment. But it seems awfully daunting to hope that she would not be a happy fluke, an exception, that others would react with such compassion and tolerance as well. Perhaps if the Doctor was with her, or if she had a secure way of hiding if something went wrong; he does seem to think it may be worth a try... But she can't follow that thought for very long before being cowed by anxiety and shame.

The Doctor's distracting question, then, is very welcome, and she hesitantly peeks up at him with curiosity just as shy. "How does one go about building an entire castle?" The snake once again does quite the opposite, resting his head back on her chest, though whether satisfied or disappointed, who can say.