First, never make her feel out of the loop. Include her on all discussions, even if they don't interest or include her.
Second, always be unfailingly polite. Not in a sucking up fashion, but in a very respectful manner. She's southern aristocrat and you must approach her in the proper manner.
Third, If you disagree with her, always be sure to ask her opinion first. Then respectfully say, I disagree, and here's why. After you've stated your case, then focus on places where you agree and work from there.
Fourth, if you have an idea that you think she'll immediately be opposed to, start small. Insinutate the idea slowly into the conversation over the previous week. Make her believe that it's her idea and let her take credit for it.
Fifth and last, never, ever give her cause to believe that she's been left out of the loop or ignored. Her ideas are valid, even if ultimately we do not use them.
Those were the basic advice we gave. So far I've tried them out and they seem to be working well. She's basically a good person, just a little different managerial style than we're used to dealing with in our Board President.
Einan