Final answer:
The nurse should provide a Band-Aid to the child where she had the injection to protect the site and prevent infection.
Step-by-step explanation:
The nursing action that the nurse should implement in this scenario is to provide a Band-Aid to the child where she had the injection. Band-Aids can help protect the injection site and prevent any potential infection or contamination. Additionally, applying a Band-Aid can provide the child with a sense of comfort and security.