I once tried to find one too for a friend of mine. The best one I could find was the "Womens Lounge" at Elite Fitness Forum. The discussion is no-where near as focused as it is on here though. They tend to go off topic quite a bit and into topics such as shopping for shoes etc.....
BUT.....they do have the odd libido, menopausal, birth control and hormonal questions pop up from time to time and would probably even be worth going back through the threads to see what she can find.