Final answer:
The etiology of her condition could be vascular compression of trigeminal nerve, which can result in facial pain or trigeminal neuralgia.
Step-by-step explanation:
The etiology of her condition could be Vascular compression of trigeminal nerve. This condition occurs when there is pressure on the trigeminal nerve, which can result in facial pain or trigeminal neuralgia. It is caused by blood vessels compressing the nerve, leading to symptoms such as sudden, severe facial pain or facial spasms. To diagnose this condition, a doctor may recommend an MRI or CT scan.