Hi,
There are various types of headaches like Migraine, Tension-type headache, Cluster headache, Headache associated with head trauma, Headache associated with vascular disorders, and Headache associated with nonvascular intracranial disorder.
Did she have some trauma?
Does she have fever, vomiting or any other associated conditions?
I think what she can have is Headache associated with vascular disorder.
The causes could be acute ischemic cerebrovascular disorder, intracranial hematoma, subarachnoid hemorrhage, unruptured vascular malformation, Arteritis, and arterial hypertension.
I think you should be consulting a neurologist and cardiologist for further evaluation.
An imaging study of brain is necessary.
Keep me informed.
Bye.
High blood pressure normally does not have any signs. She should go to the doc to have a ct scan. This will rule out most of the severe disorders. Could be stress, migraines, or sinus headaches. Those are the most common cause of chronic headaches.