I need suggestions for my book.;)

I think it's interesting that you say "the feminine side of life" but if there are only females, I doubt there would be a lot of "feminine" traits. I mean, when people think about the stereotypical personality differences between men and women, men are strong, and tough, while women are sensitive and nurturing. I would imagine that without men, the girls would probably be somewhere in the middle of the two. There wouldn't be any assigned gender roles. Also, I don't know exactly what direction you're taking your book, but I wonder if the girl might feel empty or that something is missing in her life in terms of romance. Assuming she is heterosexual, she may long for romance or intimacy but can't get that from another female.

To start, I think you probably need to research on the life of the amazons--i.e., legendary female warriors. This will give you an idea of what this women dominated society consider important. From reading Wikipedia, I just learned that the amazons are a mythical group or society from Greek antiquity. Of course, I thought they were true to life inhabitants of South America, but it seems the concept of an all female society dates back to classical Greek. Anyway, I'm a guy so I can only speculate on girl problems. If I was doing your research, I'd probably do a simulation using online simulation/games, but substituting the proper parameters and see for myself how things would turn out.