When Belle takes on (off screen) Rev at poker it doesn't go well. She keeps losing and when she runs out of cash and stakes her clothes, that doesn't help as she loses at strip poker and ends up naked. She gambles her final hand... a messy forfeit vs her clothes and stake money back, and she loses. So she has to give herself a self-trashing for your enjoyment.

Luckily Belle is a good sport and goes at it with yoghurts, trifle and treacle.