Thank you for your query on Healthcare Magic.
With the description of your daughter complaints of constipation
, gain in the weight, swollen stomach, feeling of sluggishness and sick, and tiredness first I would like to rule out the hypo functioning of the thyroid gland.
usually the complaints are characteristic and it is a treatable condition by doing blood test for thyroid hormone levels.
There for I advise you to consult the Pediatrician
for examination of the child and for physical examination followed by investigations with thyroid function tests
Give more dietary fiber
rich food and plenty of water to drink.
Hope I have answered your query.