Who read "Birdie and His Friends" to Helen?

From the text:

Mrs. Sophia C. Hopkins had a copy of Miss Canby's "Birdie and His Friends" in 1888, the year that we spent the summer with her at Brewster. Mrs. Hopkins was unable to find her copy; but she has told me that at that time, while Miss Sullivan was away on a vacation, she tried to amuse me by reading from various books, and although she could not remember reading "The Frost Fairies" any more than I, yet she felt sure that "Birdie and His Friends" was one of them.