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You spelled fish wrong, smarty pants. And it's Bill Clinton. Geez!
You don't need to replace her. If you are concerned about having an uneven number of groomsmen vs. bridesmaids, don't worry, many people have different numbers for each side. Even if your friend is a really good friend that you want to ask at the last minute, it is a lot to ask her to be the "back up," and to spend a lot of money on a dress she did not get to help pick out almost immediately. If you want to include her, have her help with the guest book or some other task, but to ask her to be a BM is a little much.
They would probably be better after a few days in the mail, because Peeps are always better stale.