Have you read this thread about agreements?
http://www.eccie.net/showthread.php?t=609156
At this point, there are only 359 responses to the OPs question.
Sorry, I could not resist.
What recourse do you have? You can start a thread like above and hope you either shame her into submission or destroy her livelihood. Or, you can just hope she makes it up to you.
The only assurances you can count on are a lady's reputation. This is why screening a lady is as important as her screening you.
The good ladies will make it up to you. Then there are the ones who were never going to follow through. Finally, there are some in the middle who may figure that they will take their chances. Making it up to you will cost them some time, money, effort, etc. If they ignore you, will you just walk away, or will you raise a stink.
If a stink is raised, it becomes a he said - she said dramatic screenplay for all to witness with both parties suffering and no real winner.
Bottom line, if she screws you over and does not make it up to you, your best bet is to be the better man, don't post anything publicly, and perhaps she is eventually feel guilty.
(Nothing says you cannot post in the Men's Only area, where the drama is typically one sex only and you can warn your fellow guys of the risks of engagement with a particular lady.)