Bonito peptides are a natural ACE inhibitor, although not as powerful and with no adverse reactions. The drop in blood pressure they induce is dependent upon the severity of hypertension. The only issue is that they can get mildly pricey, up to $30/month.
I will try to get her thyroid in order and see. This is perhaps in line with some of her other symptoms over the past few years.
Also, a side note: I just looked at my mom's blood results from back in August, shortly before her biopsy. I found it interesting that her uric acid levels were within the normal range, at 3.9. The reference range is 2.4-7.0.