Mummy an' the Armadillo (2004)

Set entirely at a run-down roadside diner in Arizona, called The Armadillo Cafe, a shady tourist, named Sarah, stops for a rest at the deserted place run by a wary young woman, named Billie, and her dysfunctional and deranged family whom include her psychotic, alcoholic mother Let and her two sons; the retarded Wyatte and the crazed cowboy Jesse whom tie up and hold Sarah hostage when she begins asking too many questions about their pasts and is subjected to their mind games and physical and mental torture to find out her connection to the family and dark secrets they hold.