I wrote you an answer but somehow it did not post. Sorry. Very frustrating. So I'll try again.
I have never heard of a symptom like that being linked to hypothyroidism: however, knowing that the likelihood of your wife being adequately treated for hypothyroidism is very low, I would like to suggest that we have a look and try and assess her status and see what is needed. If she can get that taken care of , the you could see if the issue is still there.
Doctors erroneously think that TSH is all they need to know to diagnose and treat a hypothyroid patient. Wrong. The most important indicator is an evaluation for the existence of multiple symptoms typical of hypothyroidism. So first please review this list with her and tell us which ones she has. Don't assume that any symptoms is just age related. Tell us about all of them.
Increased sensitivity to cold (temp. below 98.6 which is considered normal)
Constipation ( have to use fiber or laxatives)
Dry skin (have to use moisturizer)
Elevated blood cholesterol level
Muscle aches, tenderness and stiffness
Pain, stiffness or swelling in your joints
Heavier than normal or irregular menstrual periods
Slowed heart rate
Enlarged thyroid gland (goiter)
Next please post her latest thyroid related test results and reference ranges shown on the lab report. Also tell us her thyroid med and daily dosage.
Myxedema psychosis, is a relatively uncommon consequence of hypothyroidism, such as in Hashimoto's thyroiditis or in patients who have had the thyroid surgically removed and are not taking thyroxine. A chronically underactive thyroid can lead to slowly progressive dementia, delirium, and in extreme cases hallucinations.
Other causes of auditory hallucinations should also be ruled out, including mental health conditions (e.g., schizophrenia, dementia, and delirium), substance abuse (e.g., alcohol, LSD, and PCP), and lack of sleep.