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This is Dr. David
I agree with trying to get her to see a neurologist
she could have a food allergy which could be causing these headaches and nausea symptoms
she could be allergic to gluten or milk lactose or some other foods or oils or preservatives in her food.
you may need to keep a food diary of what she eats and see which food worsen her symptoms.
she needs a full neurological workup, MRI scan of the brain is better than a CT scan of the brain.
she could be having migraine headaches and may need migraine headache medications.
let me know if you have questions.