Sorry that you had a wasted journey, it's bloody frutrating, but I'm afraid symptomatic of this business. Glad you posted a report.
There are a few of the old time whores who have been around a long time, and provide a decent v.f.m service.
Then there's the fly by night chancers, who pop up one day, and are soon gone.
In this case it is likely the usual bollocks that she has had an offer of a longer booking, so you get bumped, or she has "double booked" to see which punter turns up.