It looks liike you're getting a lot of advice here, but I thought I'd chime in with my experiences too...

I had high blood pressure (can't remember the number) and was given a month to get it down without medication. I eliminated all cafeine and salt from my diet the very next day and met with my doctor weekly to see if it helped. After two months, there was still no change so I was given medication which helped right away.

At the time, STRESS was the main cause of my HBP. I was only 27 at the time. Once I changed a few things in my life and concentrated on things that were important to me - my marriage mainly - I stopped taking the medication. I just "knew" the stress was gone. It was the best feeling in the world. On my next check up, my blood pressure was fine.

So, I guess I'm tossing a vote in for taking medication until she can rearrange things in her life to be less stressful. You said she'd try almost "anything" and I'd consider a new work environment. No one ever sits on their death bed at the age of 100 wishing they had spent more time at work.

Like some have suggested, have her test her blood pressure after a week off of work. That may indicate if the job is the real cause (assuming she let herself forget about work for that week) or if the stress is something else she hasn't shared yet.