Lay the Favorite (2012)

Beth is tired of stripteasing and coaching dances in Florida so she quits her job and moves to Las Vegas, seeking job as a cocktail waitress. Accidentally, she meets Dink, a professional gambler with a system. He discovers Beth's talent for numbers and hires her as his protegee. When she show her interest on her mentor, his wife kicks her out of him. Against his advice, Beth chooses a dangerous job as she work for Rosie, who runs an illegal operation.