Get her down to the Between the Sheets area and let Kronkette talk to her. She will get her going.
I think that bunnymt hit most of it on the head, but trust me you can turn it around However, she has to WANT to do it.
I would say that you communicating things to her in a positive way should be first on your list. Having an open communication line in the bedroom is key.
Have fun and hang tough, she just needs a kickstart. That kind of stuff happens after kids, marriage etc.