Story leaves me wanting more: Permission to Enter

Zadie Smith's story Permission to Enter (good title, which I misremembered in yesterday's post) in current New Yorker is a good example of a story told in very small sections that covers a lot of territory - in time span, and in evolution of the main character - as we see her in each of the small sections move from a sheltered young "church" girl in London and, mainly by contrast with her much less conventional best friend. Main character, Keisha initially but later adopts a less ethnic name, is a serious student with a very religious boyfriend who's cold and kind of scary - they go off to same college together, lives totally entwined with one another, make few other friends - but gradually she breaks away from him when she's struck by the beauty of a fellow student. Her relationship with best friend from childhood carries on through college years though they grow emotionally and politically farther apart from each other. Story ends rather abruptly - which makes me think this is part of a novel or a sketch for a novel perhaps? Or a longer story that appears here only as a section? I don't think Smith could reasonably sustain this style - very short named sections - over the course of a novel: I think of the novel Mrs. Smith, which I liked a lot, telling a whole life story in short chapters - but these were chapters, not mere moments. Though the story comes to no conclusion, I admire the ambition and technique and it leaves me wanting to know more about the characters, which I suppose is a good thing.