My Technique works great!
I have been trying to tell guys this for a while now. Tell these chicas upfront that you will not fall for the ookey doke move! You don't have to be an asshole about it, in fact, you can make it fun and have a good laugh at the same time. After getting to know her name, age, where she is front, etc..... With a big smile on your face ask her "How is your dog? Did he run away today? Did your cow die this afternoon? Is your mom having a leg transplant tonight?". She will probably look at you and say "What are you talking about? Are you crazy?"
At that point just start laughing and explain that you are just joking with her. Tell her "Listen, I have heard every excuse in the book! There is no excuse you can come up with that I have not heard before. At 4AM if you tell me you have to leave because your child is in the hospital, or your mother got hit by a car or your friend was locked up by the police, then I will only pay you ST not TLN!" You don't have to be a dick, you can say it with a big smile on your face and you both can laugh about it.
I agree with Mind Bender, pay her in front of hotel staff / security. To add to that, if there was a problem and she is very angry about her pay. I would advocate that you take off for a couple of hours. Go to After 1 or go grab a bite to eat. That way if she returns with the police, you won't be there and by the time you return, they will have left.