How high is her blood pressure? Is this a recent development or something she has had for a while? There are definitely many ways that one can decrease blood pressure without using medication - for example, nutrition (decrease sodium intake, etc.), exercise (increase it), natural supplementation (below), etc.
You can always just get her to use Hawthorne Berry and Garlic - dosing/timing below.
3g/day (with meals, spread over 3 doses)
Dose 1 - 1g with breakfast
Dose 2 - 1g with lunch
Dose 3 - 1g with dinner
600-700 mg/day (with meals, spread over 2 doses)
Dose 1 - 300-350mg with breakfast
Dose 2 - 300-350mg with lunch