Oh, my! Well, my cat, Belle, is polydactyl, but that's not nearly as impressive as your DD (and my Tigger is, too, but I'll wager that you don't have a son, Tigger

).
I would think that she will have to be off her feel for awhile for that surgery. Doesn't sound like fun! I know someone who has a son who has an extra piece if bone in his foot that was removed last spring and he was immobile for months. How old is your DD?