The stage show isn't relevant to how she will move on a lapdance. I always found lapdances easier since you have more control of your body and center of gravity than teetering in high heels on a slick floor. It took me a long time to get good on stage, yet I banked every night. You can tell who will move smoothly and fluid on a lapdance by watching a girl just walk around the club, her body language, and how she carries herself.
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"What I do know is that if Karen Carpenter and Mama Cass Elliot had shared that sandwich they'd both be alive today." -Michael K