As the plot thickens, must the style thin?

The plot really begins moving along in the last third of Rachel Kushner's The Flamethrowers as unnamed narrator (another homage to Proust?) leaves the Lake Como estate of her boyfriend's family and gets a ride with the groundskeeper - who'd been eyeing her w/ suspicion and contempt - to the family industrial complex where her boyfriend, Sandro, had gone to try to talk reason to the recalcitrant Board of Directors; narrator thinks she'll take some footage of the tire-making complex for a film she hopes to complete - she's a very desultory at best artist, despite her immersion in the hip NYC art scene of the 70s she spends very little time actually working on any of her art or even thinking about it and her plan to shoot some smokestacks is extremely amateurish - and this may be Kushner's point - in any case as she arrives at the factory she wanders around a bit and comes upon boyfriend Sandro in deep embrace with his cousin (!) Talia. A great surprise to her, but hardly to us, as we have seen (she has not) that Sandro is a player who's just more or less using the much younger, less experienced narrator for lots of quick sex (in return for what? - his wealth, which she comes to despise, as does he, and for access to higher ranks of the art world, of which she takes little advantage). She then takes off with the groundskeeper, heading on the Autostrade (built with money from boyfriend's tire-making family) for Roma. So the plot is now moving, as we wonder where she will go, how she will endure, and what vengeance if any she will take on the nasty, Fascist Valera family that would so discourteous and even hostile to her. One thing I note, however: as Kushner accelerates the plot, at last, her writing style breaks apart - a lot more breathless sentence fragments, the bane of so many first-person narratives (usually first-person present) - I continue to see a huge talent potential here in Kushner, in this her first (I think) novel, and hope as this work progresses and her next work germinates she can pull together both plot and style - like a tennis player learning to work both touch and power.