Of the blood pressure medications you listed, Losartan and Norvasc are medications often
used to treat blood pressure. Having a lower than normal blood pressure
is not dangerous unless there are associated symptoms (light-headedness, fatigue, dizziness, etc.). If experienced, you should speak with her cardiologist/physician about titrating her medications appropriately.
Of note, one medication that she should also be on is a beta blocker (given her history of unstable angina).