the first thing i would do is make sure she is hydrated. the water cure is salt and water. one teaspoon per gallon and start drinking. not the whole gallon at once but keep drinking over the next 24 hours. do not drink anything else.
it could be a form of acidosis. put her in a warm tub with a couple of cups of baking soda and a couple of cups of epsom salts and let her sweat. baking soda alkalizes, epsom salts relaxes and sweating gets rid of toxins.