Hello, first of all you need to make sure the measurement is correct. For example: if she measure her blood pressure right after a headache episode then it will probably be higher than usual. If she does measure her blood pressure when she is calm, has not just smoked, has not ran to catch a bus etc and gets the same (or very similar) readings in both arms then she needs a basic biochemistry panel to check for indications of secondary hypertension. If there is nothing to suggest secondary causes then she can use one or two more drugs of different classes. You haven t mentioned whether she takes other medication or not. In patients like her I usually add either a diuretic or a calcium channel blocker or both depending on verified blood pressure measurements and the overall cardiovascular risk of that specific patient. Her medical history is crucial to decide which treatment is better. Diabetes and kidney problems are examples of conditions that may play a role in drug class choice. If you d require more specific guidance please ask again with a complete medical history. Kind Regards!