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She could be having infective gastroenteritis
which can be causing this problem. Is she diabetic. Get her blood sugar checked. There is less fluid in her body which is why these problems. She needs to drink WHO ORS
called Electral, it is written on sachet how to use it. This will reduce the loose motion
. Give her ORS in sips. I would recommend she be taken to Hospital as soon as possible for IV fluids.