Question

is the sentence: The hostess said, “Do sit down.” commanded, advised or requested?

Answer 1

Answer:

as she is hostess the sentence should be requested

Answer 2

Answer:

Advised

I really don't know how to explain why it'll be advised but, here "Sit down" would be a command, "Can you please sit down?" would be a request. This is only advice.

Another example would be "Do try it!" it's advice, it's a recommendation.

Hope this helped! Tried my best