If, and its a big if, she is genuinely open to escorting she clearly wants longer bookings. If she were local to me I'd jump at 3 hours for £350 if the services were aligned with my tastes.
Fair point but longer bookings is only something I would do with a regular or at least a very well reviewed SP.
A risky and expensive TOFTT
The more you spend the more you save.

You would think they would establish a regular customer base by offering a fair price for a 30minute “taster” session.