The Cinderella rules

THERE'S A LITTLE BIT OF CINDERELLA IN EVERY WOMAN . . . . . . except Darby Landon, or so she thinks before meeting the three fairy godmothers of Glass Slipper, Inc. They guarantee they can bring out the princess in any woman. But they'll have their work cut out for them with Darby, who's more comfortable in jeans and cowboy boots than designer gowns. But when she's called from her Montana ranch to squire her impossible-to-please father's star client around the D.C. social scene, Darby has to turn into the queen of chic . . . and fast. Between torture-chamber sessions of tweezing and teasing,…