You arranged something, yesterday, and only confirmed it 30 minutes before the meet? I'm not surprised that she wasn't hanging around. She probably had another punter.
Also, about the 2 seconds thing. If you were with an escort and she took 2 seconds to reply to each text, would you be annoyed? Imagine how many messages she gets a day. 2 seconds to reply to you is not 2 seconds to reply to everyone. I think you're being unfair by calling her a timewaster.