Hi Timberman,
It is important to know if your wife is a 'vagal afibber' or not, because beta-blockers can make the vagal afib worse.
I am vagal (do a google search to find out about the 2 different types of Lone Afib - LAF), and I have found that Flecainide is the most effective drug in my case, perhaps your wife could discuss with the Doctor cutting back on her drug intake to just Flec alone plus the warfarin.
Because the Flec keps me in sinus rhythm 24/7 I don't bother with the rat poison, and my Cardio can actually see the logic in what I am doing, amazing
It is also important to find out the 'triggers' for the afib, in my case it is fishoil and caffeine, and then avoid them. I have also found a low GI diet to be beneficial.
RB