Alright, it looks sort of like Minako if viewed straight on so her ponytail is hidden, but the blog entry said something about 桂さん (Katsura-san? Kei-san?)
She's holding Bara no Hanakanmuri (薔薇の花かんむり), book 29 (or 31 if you count the Premium Book and Illustration Collection). Katsura isn't even mentioned in the entire book.
I wonder if I'll get to show up in this oneexcited