Alternative medicine for high blood pressure after heart surgery?

my mom had three stints put in 3 weeks ago.her kidneys are a bit stressed due to a blood pressure medicine they had her on for 2 years.creatinine level at 2.0.had a low grade fever but no longer due to antibiotics.tonight, after 3 weeks BP went up to 170/90.what can she do naturally to get it down?
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