In 1937, Katharine Hepburn was struggling. Or rather, the idea of “Katharine Hepburn” was struggling. Though she’d already claimed her first Oscar win in 1933 for Morning Glory, and contributed to the enormous success of George Cukor’s Little Women, a string of financial flops in the late ’30s meant she was proving Marie Dressler’s old adage true: “You’re only as …