Tell her that if she keeps eating them a big lump will grow in her stomach and it will never go away unless she has surgery while she is awake.
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Gently try to amend her behavior without making it a big deal. Make a point about good manners at home and out with others. This may be unconscious behavior on her part, and discussing it at a quiet time in your lives would be good.
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This question made me throw up a little.