Almost certainly not appearing in chapter V:

TWILIGHT SPARKLE (writes): "When we got to the library and Moongleam (as she has insisted we call her) saw the collection, she bounced around the room in a circle for a full minute, calling out 'Yes, yes, yes, yes!'. She seems very excitable to me. Is this normal for her species? Is it likely to happen oft-"

(a short moment of embarrassed recollection later)

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