f a provider has registered on Date-Check and P411, she is also reviewed around 15 times on TER and she is also traveling, Is there still a remote possibility that she is a LE

probably not.  LE would likely not go to that extreme to bust you.  Time and money factors.  They mostly set up stings in a motel room to catch a bunch of guys.  It's very rare that they go after just one person, not cost effective.

Swim

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Where have you been for the last 9 years?  Was you first experience so bad that you decided to quit?

If you read his only review. The dude didn't have a good time. Apparently the lady did not complete the task at hand.

It's possible that everything is a giant conspiracy, but ...

If she tours, she is in multiple jurisdictions but she can't be working for ALL of them (unless it's an unlikely Fed thing) and be spending so much time in other places.  Boston Police aren't going to pay to send one of their cuter undercover cops to LV for a week, LA for a week, Miami ...  You get the idea.  

If the guys writing the reviews themselves have written many reviews (and not just one each: hers) and seem legit, it doesn't seem likely that she's LE and has been providing authentic experiences to them just to lay a foundation to set you up.  NOTE: You can PM a recent reviewer and ask for comments or advice such as, "Is she LE?"

For all of that, it is still possible that a legit provider was recently arrested and has switched sides to lighten the charges or penalties.  

If something doesn't seem right to you, apologize and leave.

Apologize and leave would be to late, just smile for the camera...