Three Violent People (1956)

Former dance hall girl Lorna, masquerading as a lady, meets and marries Confederate ex-officer Colt Saunders, returning to his rich Texas ranch. Everyone there is enchanted with Lorna. But the carpetbag government is set to grab all the big ranches, unless the ranchers (led by Colt) decide to fight. And one of the carpetbaggers knows Lorna's secret.