Nothing is foolproof, but if you've done your homework, which it seems you have, there should be nothing to worry about. I would have no worries seeing a provider with good postings on multiple boards. It wont get any better then that.  

Relax, take a nice bottle of wine, treat her like a lady, and have a great time!!!

I have indeed heard of this kind of sting.  While nothing was confirmed (everything I heard was third-party or hearsay), the general gist was this:

A girl was busted.  She is told if she cooperates and helps with a sting, she will get reduced charges.  She agrees, sets up meetings with her regulars, and provides LE with personal info on her former clients.  They are busted.  Eventually word gets around and this sting dries up.

An even worse story I heard was this:  a girl sets up meeting with clients.  They show, and are rendered unconscious and robbed.  They wake up several hours later in a bathtub of ice with kidneys or other parts of their bodies missing.

Like I said, I have no idea if these are true stories.  The first one seems reasonable tho I discount the second.  You can never be too careful, right?  Just cuz you're paranoid doesn't mean they aren't out to get you. LoL