Thank you very much for the useful information.
She has lost significant weight --- and that too with out purposeful dieting plan.
This can be due to a thyroid disorder (thyroid gland producing more hormones).
Malignancy (cancer) of gastrointestinal tract (stomach/colon).
Other occult malignancies (hidden cancers) of major viscera of body such as liver or lungs.
Malabsorption syndrome (pathological conditions of bowel leading to impaired absorption of nutrients one eats leading to gradual weight loss).
Depression leading to reduced appetite and subsequent weight loss.
I honestly believe that there is nothing much to be tried at home and wait.
She should have an urgent possible consultation with an Internist, discussing all the details i have mentioned to get a management plan chalked out that suits best to her needs.
A comprehensive clinical examination, chest x-rays, colonoscopy etc will be required to exactly identify the underlying cause for this weight loss so that an appropriate and targeted management plan is instituted in time.
While awaiting consultation keep her adequately hydrated.
Well balanced and nutritious diet should be given.
There is no harm in continuing with over the counter multivitamin preparations.
At her age the most common cause for this unexplained weight loss are cancerous conditions and that worries me the most. I certainly would like to rule out/diagnose any sinister pathology at earliest.
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