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Ugh that's awful, I get it from a medical pov.
Doubly awful cause I bet spiro would also LOWER her BP and it's a super common diuretic cis people use all the time... and they give it to people with acute high BP and even chronic hypertension...
Anyway, there's plenty of meds that work to lower BP and some nutritional stuff she can do (low sodium potentially). Hope it works out.