Here's a networking site for women who write, as mentioned on Charlie Rose. There's an group within the site for just about any interest/genre, and if you don't see yours, you can create your own.
As an aside... an editing discussion. It's common to say "women writers" or "women aviators, etc...." (and I've used it myself out of laziness or because I'm following the crowd) but I actually kind of hate this because nobody would say "men writers." Better to say "women who write" or if you must differentiate, "female writers."