The reference to the Bibliothèque Rose is there on page 76 of “Speak, Memory.” It will reappear in ADA and in “A Russian Beauty.” Here is a selection of annotations by Brian Boyd (Ada Online) with the correct information*:

55.30-31: At ten or earlier the child had read--as Van had--Les Malheurs de Swann: Darkbloom: “cross between Les malheurs de Sophie by Mme de Ségur (née Countess Rostopchin) and Proust’s Un amour de Swann.” [   ] As a child Nabokov himself read Les Malheurs de Sophie (1859) and others in the Bibliothèque Rose series, by Sophie Rostopchine, Comtesse de Ségur (1799-1874) (SM105); Rivers and Walker comment that these books are aptly fused with Proust here because despite what Nabokov calls their “awful combination of preciosity and vulgarity” (SM 76) they “had the power of evoking later in [his] life involuntary, Proustian memories of his childhood in Russia.” (269) MOTIF: Ségur.
The series Bibliothèque rose illustrée (Illustrated Pink Library), was founded by the publisher Hachette (a homophone of “Ashette” below, 114.16-17) in 1859, the year Les Malheurs de Sophie was published. Cf. “A Russian Beauty” (1934): “Her childhood passed festively, securely, and gaily, as was the custom in our country since the days of old. A sunbeam falling on the cover of a Bibliothèque Rose volume at the family estate, the classical hoarfrost of the Saint Petersburg public gardens. . . . ” (SoVN 381) Cf. also VN’s reminiscence of the “‘Bibliothèque Rose’ volumes, with their stories about boys and girls who led in France an idealized version of the vie de château which my family led in Russia . . . ” (SM 76).

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*- The Brazilian collection “Menina e Moça” seems to be unrelated to “La Bibliothèque Rose,” but to belong to the “Bibliothèque de Suzette”(A recurrent misapprehension of mine…My bad!)  Mme de Ségur’s books in Portuguese are in different collection (Aillaud & Co. Lisbon/1903). In later years, by “Livraria do Brasil S.A”, “Melhoramentos,” and various others & up to the present days).