Final answer:
The examiner asks the patient to try a second time to test the strength of the facial muscles.
Step-by-step explanation:
The examiner asks the patient to try a second time to squeeze her eyes shut against resistance in order to test the strength of the facial muscles. By asking the patient to try a second time, the examiner can assess the degree of weakness or paralysis in the muscles. If the patient is unable to generate enough force to keep her eyes squeezed shut, it indicates a weakness or paralysis of the muscles controlled by the facial nerve.