She could have had a moderate hypertension for many years. The

She could have had a moderate hypertension for many years. The same thing happened to me. I had no symptom too. My body got used to it.

Most likely she had essential hypertension, but still she should rule out secondary hypertension.

For this level of hypertension, a calcium channel blocker such as amlodipine or a beta blocker such as metoprolol can do it.