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three main reasons are conceivable: Heart failure , renal failure or massive varicosis. Her GP is supposed to do the blood works to exclude renal failure and heart failure. He should perform an ultrasound to see if there is ascites in her abdomen as well (which would be a bad sign of a liver problem or cancerous issue). If he doesn't find anything a phlebotomist can measure the veins and find out if they are not able to transport veous blood back to the heart.
She should keep her legs lifted up whenever she sits to help the water float out of her legs!