It seemed to me that the other bride's real complaint was that she could not get any definite information, not that Chelsea Clinton's wedding was nearby on the same day.
When that article was written, her town was only a "likely" site for the Clinton wedding. So no one knew, or no one could tell the other bride if indeed the Clinton wedding was going to be there, or what roads would be closed and when. So she had no way to make alternative plans for her guests.
If you've been planning something for two years and suddenly there is the potential for a huge problem right smack in the middle of your plans, but no one can confirm or deny that the problem will exist, then I can't blame someone for being a bit upset.
And the reporter might have asked a leading question that caused her to use the word "hell." I've read that article three times now, and the more I read it, the more I feel that the writer was trying to create a sensational story out of very thin cloth indeed.