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How old is she? How tall is she? How much does she weigh? Any weigh change? Any other symptoms? Any medical problem? Any surgeries? Any medications including over-the-counter pills and herbs? Any family medical history?
I don't think her high BP is due to her not drinking enough water. Any other symptoms besides high BP?
But dehydration (not enough liquid intake) causes temporary kidney problem such as increase in blood creatinine. If she drinks enough liquid, the level will go down. But poor controlled BP causes kidney problem which is not reversal .