This was surely inappropriate of the ML to hold your change ($10) right to the end of the session and then assume you would allow her to keep it. She should have given your money and later ask if you were willing to give her any tips. Given her performance, it didn't appear she deserved anything more.
By the way, out of the three girls shown to you was your choice the best looking out of the three? If they were below average you should have walked.