Keep quiet.
Grancey's said it best. Sometimes family obligations, are just that, obligations, and she doesn't have much of a choice in the matter.
Put on a happy face, that you aren't being forced to wear an ugly dress with uglier dyed shoes, and being paired wiht a groomsman who sweats and is 6 inches shorter than you are, go to the wedding, be supportive of your friend, remember she is your best friend, and go after that guest book witih gusto..
