It looks like about halfway through July she began complaining about overwork, and she took a break. She was notably absent at the August 4 debut of the Den-O movie (Ah,so that's why Naomi was filling in for her)The article talks about how little she is in the August episodes, and how she's completely gone in the first two episodes in September.I can't talk about the next part without getting into spoilers, but although it looks like a "last resort matter" apparently without it the story cannot proceed correctly.However, she's continued to update her personal blog. And has expressed a desire to return to filming. She said she felt motivated watching the movie. (8/27)However, in September she said said she cannot talk about her situation. And she apologizes to everyone for the problems she's causing to the viewers, cast, and staff.There are some fans that tell her to rest, and that they will wait for her return. But there has been criticism that even though she's on a break, she still has time to update her blog
I watched ep 30 again last nite, and she was in the beginning and end shot, in a yukata on the bridge with Ryotauro during the fireworks display.