I'd consider calling the hospital...it's possible that it could be either, but I'd err on the side of caution and say high blood pressure
. If that's the case, could she be slurring her speach? get her to smile and make sure that it's even on both sides (if one side is not smiling, call an ambulance)...this will check if she's having any signs of a stroke
the other possibility is that she could have a sinus infection
(which is MUCH LESS serious)....if that is the case, she needs to see her doctor anyways as sinus infections can get worse and cause complications. I won't go into them as they may scare the poopy out of you :) But if it is a sinus infection (which probably it is) then it is easily treatable with antibiotics.
But seriously, check the smiling, check her strenght in both hands (get her to squeeze your index fingers), listen to her speech and call the hospital if you're in doubt...call the ER if you have to.
Merlin the Cat