The following are all causes of high blood pressure:
Smoking
Being overweight
Lack of physical activity
Too much salt in the diet
Too much alcohol consumption (no more than 1 to 2 drinks per day)
Stress
Older age
Genetics
Family history of high blood pressure
Chronic kidney disease
Adrenal and thyroid disorders
With a blood pressure that high it also puts her at risk for stroke. She needs to be treated and losing weight would be a good place to start..