Most likely nothing comes of this but you may want to advise your liability carrier of the allegations.
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I would also let the nurse know that she should make her carrier aware of the statements since you said she is a contract RN. Great opportunity to do some teaching with your remaining staff.
Truth is usually a defense. Also because defamation is usually an intentional act it makes it harder to hold the principal (you) liable for the actions of the agent (contract nurse). May have also been outside the course and scope of her employment to make such statements. Very fact specific but I would be surprised if anything comes of the statement. Of course better to not risk a lawsuit so some teaching is probably warranted.
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