Was Shirley Jackson a good short-story writer?

As I'd feared, Shirley Jackson's somewhat long story Elizabeth, in "The Lottery and Other Stories," doesn't really make good on its promises - it establishes a kind of interesting central character, Elizabeth Style, a literary agent with a sad, downbeat professional and personal life, and begins with a potential conflict at the office, as her boss and sometime liver has hired a new secretary, the sexy young Daphne. Can your foresee many dramatic possibilities in this triumvirate? Can you even imagine a movie? A miniseries? I can, and I have to believe Jackson could, too, and that she maybe began this story as a novel and then more or less abandoned it, took out the knife, cut it short, and called it a day, that is, called it a story. It ends with Elizabeth conniving to cost Daphne her job and then its the end of a rainy day at work. There are so many elements her introduced and not developed: the weird minister who keeps sending his poems (and his checks) and whom the the agents cling to for dear life, the counter-boy who submits a play manuscript to another agency, to Elizabeth's chagrin - and most of all the potential sexual and professional tensions between the women and between each of them and the boss (Robbie?). It seems weird to say that about someone who wrote perhaps the most-anthologized story of the century (The Lottery), but perhaps Jackson's metier wasn't really the story at all - she needed a longer for to let her talents unfold and blossom.