Strengths and weaknesses of Hadley's current NYer story

I've become a fan of Tessa Hadley's short fiction, though I don't think her piece, The Other One, in the current New Yorker is one of her best. It's a good story, though not great. On the plus side, she, in the wake of Alice Munro, has managed to condense what in other hands would be an entire novel into the shorter scope of a story; also, she's a traditionalist, a believer in plot and character development. Her style is plain and straightforward and insightful, never drawing attention to itself; you look "through" her writing rather than "at" her writing, focusing on the story not the teller. This current story gets off with a bang, so to speak, as we learn in the first sentences that the central character's father died in a car crash when she was 12 and that one of the 2 passengers in the car was his mistress. From that starting point, we follow the woman - now in her late 40s or so, a divorced mother of 2 - as she meets a woman at a dinner party and soon surmises that she was one of the passengers in the car (the other passenger died in the crash). All told, it's a fine set-up for a story, but as the story line progresses we realize that lots, too much, is based on coincidence and improbable behavior. The denouement, for ex., comes about when the woman foolishly heads off w/ her 2 kids to the house of a man she's become interested in - going over on a Sunday morning, unannounced, when he doesn't answer his phone - so of course he's unprepared to see her and bad things will follow, but who would do that? the story also ends, it seems to me, before the inevitable confrontation between the woman and the passenger - though a note in the NYer says that on its website TH will discuss "what happened next" - so either this is a part of a longer piece or at least there will be/is a follow-up story. It needs that - the conclusion leaves too much hanging. Also, note that I don't remember any of the characters' names; there are far too many named characters introduced amidst a cascade of info at the top of the story; the narrative could have been either compressed or opened up into a novel, but as it stands it's difficult to follow, at least for the first few pages. All told, though, it's still a Hadley story and worth the effort to get your bearings at the outset and follow the characters to the at least tentative conclusion.