I am not a lady but am posting as I have used speedplays for years. They are 4 bolt. The shoes available with a 4 bolt sole is very limited and is usually limited to the top of the range shoes as well..
DMT, Gaerne, Lake, Northwave*
Rocket 7, Sidi
However you can use 3 bolt with the speedplay supplied adaptors for most shoes. I have one set of cleats on a set of 4 bolt sole Sidi vernice carbons and one set of cleats on some old 3 bolt specialised shoes. I actually prefer the cheap specialized shoes, I dont have Sidi feet ( too wide). Speedplay warn you on the packaging that light or people with weak legs should not use the speedplay zero's as they can be stiff to clip into. They do light action ones though which are easier apparently.
If you use a 3 bolt shoe the stack height is slightly higher due to the adaptor plate. If you buy speedplays ensure you buy the cafe covers as well, as if you walk without them you will go through the metal cleat outer plate very quickly. I have assumed you are buyng Zero's or light actions not the MTB speedplay Frogs.