$300 is a lot for 30+ and as a dancer she does not have the risk and overhead of an escort.
If this is a multi-hour thing with multiple shots, different positions then recover, then going again. Sure $300 is okay.
You are bringing her found money -- little to no risk. Is she hosting or are you? If you, then even more so.
This is business. Don't be scared and don't be weird. Tell her what you want to do and what you expect.
But for better advice, provide more info... Where (hotel, etc.?) and what do you want (quickie? multi-hour? dinner? BJ in the car?) How hot is she? What kind of club and dancer? I.e., does she strike you as a $500/hr escort or $80/quickie type?
The $300-$500/hr escorts are few and far between. Almost all are through agencies AND have names (pornstar, etc) otherwise a regular escort you would have found on BackPage before the seizure would be $200/hr tops for someone experienced and very good looking. The part-time, semi-pro, under-the-radar "30+" types would get $50-$100/hr for a quick (15 min bj and fuck) and maybe tops $200 (more likely $150) for a full hour, with 2 shots on goal.
This is a fantasy for you, but it is for her as well. Most dancers who put out ITC club will do gigs OTC and when they know you as a regular, where YOU are providing a safe location, and she has a comfort level with you, then you have already lowered the risk premium by a huge factor. Now it is just agreeing a price and you can feel free to offer less than $300 without being cheap.
Again, don't know what you want for a service. But telling her that you'd like to make this a regular thing around her schedule, and need to find a number you can afford, that is not going to be met with alarm.
I used to find these "under the radar" types. One was a hot millennial who was skinny with huge tits, would text her and meet in her car in the parking garage between our office, and would jerk me off for $60 but we never went beyond that (and she didn't in a million years think of herself as a whore)
Another was a neighborhood mom. Basically FWB and we'll text back and forth. She wouldn't have made it too far as a dancer, but she was cute enough, with killer tits, and every few weeks she'd give me the greatest BBBJ and lick up every drop. Was just a cool chick. Unfortunately she got outed socially and went underground (luckily wasn't in my clique)
These arrangements are great and not what the $300/hr pro can command.