You might try something called C12 Peptide, a natural remedy that performs an enzyme-inhibit to reduce blood pressure. You could try the Nutri centre for this (www.nutricentre.com). You should really be considering conventional medicine though: high bp can cause pre-eclampsia during pregnancy, life threatening to both mother and child. She also risks strokes (ask Mike Tempsch about that - boy, was he lucky), cranial aneurysms (almost guaranteed death - my neighbour in NL simply fell flat on her face in the garden as I walked past her. She survived, but she's in a wheel chair). Sorry to be gloomy, but DON'T wait, the longer you leave it the greater the risk. This is a major problem.

Has she had a cranial MRI scan?