Becomes a Woman, Betty Smith’s sort-of warmup to A Tree Grows in Brooklyn now premiering at the Mint Theater Company, begins wonderfully. In the sheet music department of a dime store in Brooklyn, circa 1927, 19-year-old Francie Nolan (Emma Pfitzer Price)—she shares the name of the heroine of Smith’s beloved novel, though she’s quite different from the Francie in the book—is working as a song plugger, demonstrating the little-known Jerome Kern–Anne Caldwell “Left All Alone Again Blues,” to the accompaniment of piano-playing pal Florry (Pearl Rhein), while friend/co-worker/roommate Tessie (Gina Daniels) looks on. A lively setting, a swell Kern tune, a trio of sassy girlfriends gabbing about men. A first of three acts that promises a friendly nostalgia trip, in the vein of Smith’s much more famous book. Where are we headed?