That was the one thing about that picture of William, Kate and their attendants I was so relieved over when I saw it, as the photographer did such an excellent job of posing Louise in such a manner that it's pretty well disguised she's got an eye that turns out. Very well done indeed.
It's also noticable in the video which bridesmaid is Louise, as you can tell she's walking w/a bit of a back and forth "sway" as the Bridal Procession heads down the aisle. I understood that her one eye being as turned out as it is/was also gave her serious double vision at times and that could be why she walked like that. To make sure she was walking in the right direction and right way.
Thank God her tumble wasn't more serious than a broken arm and she'll be fine. I wonder what colour Louise picked for her cast?
D