What to call the president if meeting her?

I noticed David Harvey giving Mary a hug and a kiss when she arrived at the parade today. A bit much for the occasion, I thought.
 
I have met her a couple of times and was instructed by Aras staff to address her as 'President'.
 
Call her Boss!
as in.... howaya boss. Do you need any tarmac up in that house of yours?
 
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