>>>^If it is high pitched then it can be attenuated by a good set
>>>of ear protection.  Preferably a combination of expanding ear
>>>plugs and some wrap around headgear
>>
>>She has tried earplugs + earmuffs, no joy
>>
> 
> 
> Hypertension?
> May be her blood pressure is fooling she.
> Many people get confused about high-pitched sounds.
> They came from the hearing system itself and paranoia makes the sound come
> from the tower. Tell her to try to sleep in a very quiet and far away place,
> for a few days.
> 
If that is so, she can try to see Chinese physician.  There are several 
type to massages to treat different type of ringings in the ear.

Ling SM
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