first of all kindly keep a watch as to how many times she poops per day, what is the colour, does she strain during the process and does she pass hard stools.
next thing is just check out for worm infestation by stool routine and microscopy and stool for ova and cysts.
if your kid is not dewormed then get her dewormed by Tab. Albendazole
keep a watch on weight and height of the baby for growth.
give her semisolid and liquid diet
preferably if you happen to notice passing of hard stools.