My opinion? (not that you asked.....:-) )
I don't know this for a fact, but can guess that the WH has entire legions of people dedicated to comportment, style, etiquette, modes of address, and protocol. There are legions more who would help, just to have the access to the office.
The fact that Moochelle hasn't taken advantage of any of this, speaks loudly for her character.
I can't say I'd always know the right way to behave in all these formal circumstances, but if I were Prez I'd hire a bunch of Emily Posts to give step-by-step directions.