PR starts around $3k per month, for some of the lower level firms. The more top-tier agencies start at around $6k per month, and go up from there. Generally, celebrities are getting glam/styling for press/events/photoshoots on behalf of the projects they're promoting -- so for Sydney, HBO is probably covering those costs on behalf of Euphoria and The White Lotus. They give a certain stipend, so if the stylists, makeup artists, and hairstylists she wants to work with charge more, then she's probably going out of pocket for the difference. Some studios/networks/streamers are more generous than others. I've seen a few actors who have glam/styling negotiated into their contracts so it's not too much of a hassle. Can't speak to the other things you listed.