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Even people (and other animals) can be born without an anal opening. I have seen a few human babies with this, and they were treated surgically.

Welcome to BYC. Unfortunately, the chick cannot survive. Are you certain the vent is not in a different place? There have been some born with two vents, both of which function. Birth defects can be very common, and if the chick has no vent and is not expelling droppings, I would euthanize her.