I'm not sure, but she's in wide roster on japanese federation website. Whole list:
Setters: Yoshie Takeshita, Hitomi Nakamichi, Makoto Matsuura, Ayano Nakaoji, Haruka Miyashita
Middle Blockers: Ai Yamamoto, Erika Araki, Kaori Inoue, Yuki Ishikawa, Nana Iwasaka, Kazuyo Mori
Wing Spikers: Mai Yamaguchi, Megumi Kurihara, Saori Kimura, Saori Sakoda, Mizuho Ishida, Maiko Kano, Yukiko Ebata, Risa Shinnabe, Yuki Ishii, Mari Horikawa
Liberos: Yuko Sano, Kanari Hamaguchi, Kotoki Zayasu, Akiko Ino
I don't know anything about smaller list of players preparing for WC.