Sorry, don't mean to keep everyone hanging -- appreciate the prayers and good wishes so much.
The tests so far have come out okay, but they are keeping her another night because they want to do an MRI and the medical bureaucracy has to produce a form saying the metal used to cap her brain aneurysm in 1996 at a hospital in Richmond was MRI-safe. (It was and she's even had an MRI since then in DC but the bureaucratic requirements have to be fulfilled. I was issued a card with my heart valve that verified it's MRI-safe but evidently those cards weren't standard practice for other kinds of aneurysm operations back then, and may still not be. Should be able to take care of that just by showing a card -- as I was able to do in setting up my knee MRI for next Monday.)
Hopefully she will come home tomorrow and it will all have been a minor or even better a non event. I know your prayers help.