Specialised do some women's specific saddles of various seat-bones distances. They have done alot of research around body geometry and might be a good place to start. Their Jet saddle has some good flex built in and comes in different widths. I bet your local bike shop (LBS) will accommodate you.
There are, of course, many many saddles out there that purport to be women's specific, but a market leader has to be agood statrting point?
Good luck. Let us know how you get on.
(Me? I loved the look of my Fi'zik Poggio that came on my bike as it was red cream and gold...I was shallow enough/lucky to make it work for me!)