What Causes Headaches With Shunt Pain And Blood Pressure?

Hi my daughter is 21 complaining of heqdaches she has a shunt for 20 years no problems with shunt before. Now has had head ach for to weeks at front and back of head by shunt sharp and dull pain number 8 intensity she says. We are at er now and just forums out her bp is 171 over 110 what ?s shoauld we ask