Young as she was, I was struck, throughout our little tour, with her confidence and courage with the way, in empty chambers and dull corridors, on crooked staircases that made me pause and even on the summit of an old machicolated square tower that made me dizzy, her morning music, her disposition to tell me so many more things than she asked, rang out and led me on. I have not seen Bly since the day I left it, and I daresay that to my older and more informed eyes it would now appear sufficiently contracted. But as my little conductress, with her hair of gold and her frock of blue, danced before me round corners and pattered down passages, I had the view of a castle of romance inhabited by a rosy sprite, such a place as would somehow, for diversion of the young idea, take all color out of storybooks and fairytales"
from "The Turn of the Screw", by Henry James
Context: we are in the POV of recently- arrived governesses to the state of Bly. In this passage she asked her pupil, Flora, to show her the place as a way for them to bond.
What does the bold part mean?