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She is definitely underweight, with mild anemia.  Get Hba1c, done. Please share details of her symptoms,  lab results and any treatment taken so far.Then I can help her to heal.

Yes you can check her B12 levels.

Tsh high vitamin d3 low UPRISE D60K ONCE A WEEK FOR EIGHT WEEKS FOLLOWED BY ONE PER MONTH FOR SIX MONTHS A COMPLETE THERAPY BY WHO.  YES GO FOR B12 ASSESSMENT. TRINERGIC L ONE AT NIGHT AFTER DINNER FOR 1 MONTH.

Thanks for sending across your query. There may be multiple reasons for weight loss - as her TSH was low means she may be having hyperthyroidism or may be there is some other issue also... It can be told like this only, need to go for a proper consultation and history and necessary test as per cause to diagnose the real culprit

If she is vegetrian she should take curd ,some essential fatty acid like ghee in her diet.

If she is vegetarian, she should check vit B12 Take plenty of green vegetables and milk products

Vit d is low.other things is under control.you not mention b12 deficiency symptoms like numbness,weakness,diziness here.go for b12 test and better if you visit nearby hospital for physical examination by endocrinologist.

Check RBS . At this age even mild hypothyroidism can lead to such symptoms. What about her viral parameters? Any episodes of indigestion?

Avoid fried and spicy food Water intake more Do connect and consult

Possible cause Iron deficiency anemia due to chronic blood loss Gastrointestinal cancer Chronic kidney disease Malnutrition or malabsorption Occult GI bleeding Do investigation like (CBC) Iron studies Stool occult blood test Kidney function test Liver function test ESR ,CRPThyroid profile (TSH, T3, T4) Endoscopy ,colonoscopy. Hypothyroidism Evaluation Check she on thyroid medication TSH level ,weight gain Forehead Neuralgia causes: Trigeminal neuralgia Post-herpetic neuralgia (if past shingles) Vitamin deficiencies (B12, D) Check Vitamin B12 level Consider MRI brain 4. Vitamin D Deficiency Bone pain Muscle weakness Increased fall risk Treatment: Vitamin D supplementation Calcium support Sunlight exposure 5. Hypertension Check: BP control Kidney function test concern for Chronic disease Malignancy Nutritional deficiency When to Act Rapid weight loss Black stools ,blood in stool Severe weakness dizziness Persistent severe headache , neuralgia

Need a few more details please consult for further evaluation and treatment

There is sarcopenia ( loss of muscle mass ) in elderly people . People of this age group are usually sedentary and loose muscle more so.  Elevated TSH can be seen in this age group which is physiological if there are no symptoms of hypothyroidism. Increase protein intake in foods and ask her to be more active .

Can help you, kindly consult and provide detailed history for proper diagnosis and further management