I'd say it still counts as BE, because if you compare her relative sizes, her breasts are growing bigger not just in the general sense, but also in relation to her. She goes from regular-sized to bigger than her head.
Compare page 16:
http://download.lavadomefive.com/mem...reelunch16.jpg
To ten pages later:
http://download.lavadomefive.com/mem...reelunch26.jpg
And even though she's growing bigger in general, comparing her bust size to the size of her head, the breasts are clearly outpacing the rest of her in terms of growth.