@Hiroshima MAPLE★S,
From the RPM video:
Kageyama Nagisa (景山渚紗), Moriwaki Sayaka (森脇紗香), Mori Haruka (森遥香), Murata Yuka (村田ゆか), Saeki Miku (佐伯未来), and Hinasato Monaka (雛里もなか) all graduated.
Since then, four others joined: Amano Nayuki (天野名雪), Marumoto Haruka (丸本遼), Joya Ruri (城谷るり) and Sakuragi Yuuko (櫻木ゆう子)
Marumoto Haruka was missing from the BAKU Pop Fes video.
Also, January 2nd brought two new members and a name change. Asahina Momoko (朝比奈桃子) and Nakamura Mion (中村美音) are the members and MAPLEZ is their new name.
They're back up to 10 members now.
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About Ano, I think maybe she could have had some depression issues in the past.
http://i.imgur.com/sMRvnSs.jpghttp://i.imgur.com/1RcFBmQ.jpg (increased contrast)
Back when I saw that picture, her left arm stuck out to me. Those definitely appear to be scars from cutting. I used to do that when I was depressed years ago so those scars always stick out to me when I see them. Not everyone does it for the same reasons though, so maybe her reasons were different. Just my observation.