Perhaps she pissed Givenchy off? Very strange to be having things done by third parties at the last minute.
You'd think for such a high profile occasion Givenchy would have had a team on hand for last minute fittings and alterations.
At Diana's and Catherine's weddings, the designers were there on the spot on the day, weren't they, making sure everything was ok. And another big wedding - was it the Westminster wedding? - the designer was there as the bride arrived for the ceremony.