Thanks for the query,
Let me tell you that the causes of headache in this age could be related to temporal arteritis
, brain tumor/infection etc.
Based upon the data that you have posted, I feel that your mother needs urgent neurological evaluation. Please also note that your mother's blood pressure is very high and such pressure can also cause headache. I will advise you to get her evaluated with a local neurologist
who will help you through clinical and other investigations. Headache in this age should not be thought of migraine
unless other conditions are excluded. Her treatment will depend upon the cause/diagnosis. Her high blood pressure
should be dealt immediately