You got that right. She’s into the territory of the State Dept, disguising her vacation.
State will deliver our official position, and will be told the Saudis' official position on whatever is the subject of the day. She can deliver and hear what can't be delivered officially.
What is said, delivered, received, may not be political strictly speaking. It may be very personal. Even to the degree that its political, its personal if she's the go-between.