Something sounds fishy to me. . .

How many people call off their wedding because of how they perceive their friend feels about it??? That's like saying "OK. my friend is finding it too difficult to help me plan my wedding and is jealous, so i won't marry the man i love." WHAT?! If she really loved this guy and wanted to marry him, why would she give up that easily?

Also . . .you said you've already talked her out of her "cold feet" twice.

I could be wrong. . .but I'm wondering if she has just decided that she doesn't want to get married now, and she's looking for some excuse, so that she doesn't have to come out and say she's changed her mind now that so much planning has been done and effort put into preparing for it.