I think that some of these Women have made the decision to choose Family over career once they see how it can make a difference in their children's lives. some People like E.D. want to do it all, and some are able to without it hurting their ability to be the Parent they want to be,but I think most want at least a few years of hands on childrearing before going back to that Career.
And who can fault them for that. Linda Vester would certainly be great for the FNC since she's been over in the middle east and fluent in Arabic. But maybe Linda Vester felt she should stay at home and take care of her baby.