Hello and Welcome to ‘Ask A Doctor’ service.
I have reviewed your query and here is my advice.
As per your complain it looks like she is suffering from a condition known as Xerostomia
or Dry mouth.
It can be due to a number of causes like:
-Side effects of medications if you take any.
supplying salivary glands.
-Oral infections like thrush..
Loss of taste is due to reduced saliva flow only as the saliva maintains taste buds
and in the absence of appropriate quantities of saliva there is alteration in the function of taste buds leading to altered or lost taste.
-For dry mouth she can chew sugar-free chewing gums..
-Drink plenty of water.
-Avoid regular mouthwash and use specialized mouthwash that are formulated for dry mouth patients like Biotene..
-You can also instil artificial saliva drops..
-Suck tart candies as it also stimulates saliva flow..
If does not improve consult an Oral Physician and get evaluated..
Hope I have answered your query. Let me know if I can assist you further.
Dr. Honey Arora