what brand of milk are you feeding her? Have you take her to your pediatrician to check on these? not sure if this will working for you, you can try. I ever advise by my mum that we can feed the baby with rice water, which mean you cook plain porridge the moment the porridge is cooked, scope up the porridge water & let it cool till lukewarm & try feed her with it.the porridge water with give her some carbon to build up her strength. you still have to keep trying to feed her the milk if still no effect you better take her to your pediatrician to check up on her.