Hi..
Thanks for the query..
I have gone through your query and can understand your concerns..
As per your query it looks like your mother is suffering from Apthous stomatitis leading to glossitis or redness of tongue..
It can be caused due to a number of reasons like Stress,
Nutritional Deficiency [Iron,
Vitamin B12 and Folic acid] , dry mouth, hormonal changes,
acid reflux, tongue trauma due to some sharp teeth or tongue biting habit, excessive intake of sour and citrus foods,
uncontrolled diabetes and other immunocompromised conditions etc..
It can also be a side effect of medications that she must be taking for treatment..
You need to consult an Oral Physician or a general
dentist in this regard to get evaluated and treated..
She can be advised Vitamin B complex supplements..
Gargling with soda bicarb solution can also be helpful..
Dong cool water rinses can help..
Sucking ice lollies can reduce inflammation..
Give her a soft diet and avoid spicy food..
If there is dry mouth then artificial saliva drops can be instilled..
Hope this helps..
Thanks and regards..