If she isn't interested in having intimate relations now, she may not after the wedding. I would postpone the wedding until you get some counceling. Becareful if you choose this, because she may just start faking it so you will proceed with wedding. There has to be a reason she doesn't want relations and its only fair to both to both of you to understand those reasons. Try talking to her about his, see if she is willing to get help, its nothing to be ashamed of. Good luck