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Check her diet. Is it rich in fruits, vegetables, pulses, cereals, eggs, milk. If not she needs to have a well balanced diet to improve her weight, overall well being. Also she could be having anaemia which explains pale skin and tiredness
. You can add jaggery, which is rich in iron in the diet. Also she can be dewormed for Hookworm
which causes iron deficiency
anaemia commonly. Better to get her investigated, get a Haemoglobin
, blood counts, stool examination done.