Why do we need labels and who cares. She's doing what she wants so let her. It does bother me though that some of these girls think they're above those who are sex workers. If you take money for your time, then......
I dislike the title "prostitute", as it's too often used as a denigration.
Maybe there's a difference between asking for $100 to have sex and then leave, or paying $300 for dinner and a movie to have sex and then leave, but I don't see it quite so clearly. In both cases, you're exchanging something (which always costs money) to have sex. But when it's just a cash transaction, there's a ton more honesty.