The answer can be simple or very complex.
If the BB just struck the skin of the neck, you may have some bruising and pain.
If the BB went through the skin, there may be other complications: infection from a foreign body is possible. Also, damage to other structures is a concern. The neck has several important structures in close proximity - the trachea, carotid arteries, and spinal cord/vertebral column are all within about a hands-breadth of each other. A BB piercing through any of these structures can be life threatening and you should seek care immediately.
stomach explodes
she would have to stay there for every food she ate
Nothing
You die.
Nothing good!
YOu die
They would probably throw it up...they could die, also if this person was still alive that would be incredible to begin with
you would eat fish
it would survive
If you ate human poo, (which you shouldn't) you would most likely get very sick.
They would run a considerable risk of suffering poor health due to malnutrition.
You would choke on it and it would make you very ill