Post a factual message on the board of the city it happened in. If you do not know why she no showed, do not make assumptions.

It's happened to all of us, multiple times.  That's why it's wise to have a 'Plan B' in hand, just in case.  Out of town evenings can be *lonely*.  

Cheers!

You should have researched several choice ladies when travelling on limited time.  In my case, the less time I have in a location the more names and phone numbers I research.  You can contact the ladies and find out their verification requirements so that you will have that information handy if needed.  Be sure to book the time of only your first choice and only attempt to contact one of the other ladies, if after a reasonable amount of time past the appointment start and no phone call, you conclude that your first choice is a no-show.  Be aware that highly rated ladies book up, hince the reason for compiling a large list, you may end up calling down that list before you find someone who is not booked.

1. I do my TER research and come up with 3-4 indies I want to see.  I also take along the number of a local agency, as last-resort back-up.
2. A few days before the trip, I'll call my top 3 choices, and leave a message that I'm coming to town and would like to book some time.  I want to see who gets back to me, and who doesn't.
3. I'll make a firm booking with my top choice.  With the other two, I leave it as "I don't know if my schedule will work but let's talk when I land in town".
4.  The moment I land, I call my first choice to re-confirm.  If a few hours go by and she's hasn't called back, I'll call my #2 choice and see if she's still available, but I stop short of setting up anything absolute/firm.  
5.  If the appointment time arrives and I haven't heard from my first choice, I immediately call my second choice. My feeling is if Choice #1 hasn't called by then, I'm within my rights to make an alternate plan.
6.  On the other hand, if I hear right away from my first choice, I'll call my other two choices to say hi and apologize that it won't work out this trip.  Which is fine, since I never booked anything firm with them anyway.  But, they are owed the courtesy call since you'll be surprised how some ladies will pencil in a booking on the slightest hint it might remotely happen.  
My approach is fairly aggressive but I've never been left high-and-dry.   Broken appointments can lead to pleasant surprises.  A no-show in L.A. led me to discover one of my ATFs.