Well maybe, I was just looking for impersonal opinions though. She might possibly be 12 though...
For a baby, there's a 1/100 chance it will end up deformed. For products of incest, that chance triples. Meaning there's a 3/100 chance, which is 3%. So yes non-incestual couples have a 2% less chance of producing a deformed child, but it's sort of irrelevant.