Excellent story by Susan Choi that succeeds by w/holding key information

Susan Choi - most known to me as a novelist, in particular for her excellent novel American Woman - is featured this week in the New Yorker with Flashlight, a short story - or maybe part of a in-the-works? In either event, the piece stands up well on its own merits. In short its tight focus is on a precocious, troubled 10-year-old girl who witnesses a tragedy, suffers from some form of PTSD it would seem, who acts out in through odd hostility and aggression. Her guardians (mother and aunt) send her to a child psychologist, at the request (order?) of the LA school department, and much of the story recounts her initial interview w/ the psychologist, whom she holds in contempt and fools him in a # of ways. So, this young woman could be developed much further if Choi is planning to expand on this opening - we're curious about her and sympathetic to her plight. As it stands, the story has several strengths - among them the credibility of the character, not easy to do w/ a 10-year-old in adult fiction - but of particular note is the manner in which Choi avoids a description of the key event in the story (I won't divulge it); it's an ellipsis, something all the more startling and terrible because Choi doesn't recount it directly. If there's a flaw, I'd say the story would be better if Choi ended it a few paragraphs sooner and didn't tell us what exactly the young woman (Luisa?) did to bring down the psychiatrist's wrath. We could - and should - figure that out by ourselves.