Before Barbie, and even before Little Women and Lady Bird, Greta Gerwig existed firmly in the arena of super low-budget indie cinema, becoming somewhat of a mumblecore icon when she emerged in front of cameras in the mid-2000s. Hers was a rather authentic and admirable start to an acting career, Gerwig’s impulses leading her to movies that clearly weren’t guaranteed to be commercially successful. She relished these offbeat movies, and within a f…