I think that she might be on the brink of getting her period. My stepdaughter started developing about 1 year before her period. We go through many "difficult" days with her each month. Before she got her period. We had problems with her a lot---moody, didn't want to do anything, having an attitude, etc. It wasn't easy getting through that time and its still not easy to get through her "difficult" days know. Since all girls are different, its sometimes hard to gauge when they are going to start. Just take one day at a time and keep talking about her about her body changes. My stepdaughter and I talk a lot about what is happening to her and why. Let her know that as a stepmom you care for her and want to help her. Keep talking with her about her body and how it is changing all the time. Good luck!