To answer your question.
Yes, she should see an otolaryngologist.
Most tinnitus [ringing] is from hearing damage.
But there are many causes.
And there is plenty that can be done about it.
First, correct any underlying cause, such as a blood vessel problem or tumor.
Or anxiety, or TMJ, or many other causes.
There are special hearing aids.
There are devices that train the ear not to hear the ringing.
And so on.
Find Dr. Thomas in medical any day of the week for fast, correct and comprehensive answers.
The diet, in order of preference in quantity, should look like this
whole fruit, beans and peas
Whole grains no yeasted breads, dry cereals or anything refined
Seeds and nuts, but cut out seeds if you have any diverticulosis.
A little tofu or tempeh daily
A little high quality soy or coconut milk yogurt
The soluble fiber in this strategy will stabilized colon function in about 6 to 8 weeks, then about 2 or three helpings of animal foods a week, preferably fish, can be added back.
See the book Eat to Live by Dr. Joel Fuhrman, for instructions on this type of diet.