Carolyn may well have slipped Mrs. Johnson a few $20's to keep her mouth shut.
Uncle Roger,
Remember when Mrs. Johnson became suspicious when young David was stealing food from the kitchen to feed Matthew Morgan, who was hiding out in the Old House?
Well, as you suggested, maybe Carolyn was paying Mrs. Johnson to also look the other way, when Carolyn was schlepping all of that food up to an undoubtedly very
hungry Adam in the West Wing?