Answer:
Jane's obsession with the Gulliver's Travels book and Bessie's song indicates the character of the narrator.
Explanation: The excerpt mentions a narrator who is presumably Jane herself who talks about Bessie who is her nursemaid and who fetches the Gulliver's Travels book for Jane which Jane loves to read very much.
Jane dreams about the places mentioned in the book and the various strange plants, animals and people which are discovered by Gulliver on his fictional voyage to the different islands.
She also pays attention to the song that Bessie sings and on her sweet voice but how the song now feels like a refrain and not a joyful song.
Answer: regressing
Explanation: if a person degenerates, they are losing capabilities and their qualities are decreasing or declining. Basically things are getting worse.
Regressing is returning to an older, less developed state while progressing is getting better.
Degenerating and regressing are going backward while progressing is going forward.
