Hi, weakness may be due to Anemia.
Anemia is a condition that develops when your blood lacks enough healthy red blood cells orhemoglobin. Hemoglobin is a main part of red blood cells and binds oxygen.
There are many types of anemia. All are very different in their causes and treatments.
Iron-deficiency anemia, the most common type, is treatable with diet changes and iron supplements.
High iron foods include jaggery, dates, clams, liver, sunflower seeds, nuts, meat lamb, beans, whole grains, green leafy vegetables spinach, dark chocolate, and tofu.
Kindly consult Physician...
There should some reason for weakness.
is she not taking nutritious diet.?
lack of sleep?
stress or depression?
lack of heamoglobin?
any disease eg cardiac /respiratory?
Find out the reason first then follow the treatment.
milk, milk products, fruits are always beneficial