Whether true or not, Freeza definitely believed himself to be emperor. The bigger question on her mind is what sort of emperor he was. Such a position would command a lot of respect, yes, but also a lot of responsibility. Not to mention the fact that his claim needed to be recognized by the people whose dominion he claims as his -- which she does not recognize him as her universe-ruling emperor. But there was no reason for her to doubt that claim, either.

"...I would imagine, then, that with such a vast empire you would very rarely have a chance to relax." Which was the topic of the question she had in mind. "What do you like to do when you and your people have a chance to rest?"