Her new job proceeds.
The first week is approximately nothing but annoying scut work cleaning up the massive messes that have been left before her. She vaguely feels like they should change her title to plant janitorial staff. Just this done has her contractually obligated profit margins secured, though she would have trouble finding work in anything but horrible dead-end jobs like this one if she left it at that. Gigs like this are where plant engineers go to die. Or maybe where they go to want to die, because she's having just a smidgen of that on the side. All of the nice amenities in the world don't dull the pain of feeling like you're assisting in the systematic murder of something beautiful and pure and precious.
After that, she does actually get onto some problems that are more interesting, though not necessarily less soul crushing. Essentially, it's sorted into two categories of problem.
The first is the one she's most accustomed to and best at, even though in theory it's significantly harder. Essentially, it's what she was doing at Jeneora, supporting and mending the plant herself by having a mapped and graphed understanding of what's going on across the divide. This job is both much easier than Jeneora, and also much harder. It's easier because, well, the damage to this plant is all pretty recent, this isn't a long term chronic problem that has worn away at her for years. It's a bunch of recent trauma inflicted upon her, and while that's not necessarily simple, it is simpler to diagnose and respond to.
The second is the one she actually finds most difficult. The people in charge do not particularly want to listen to her, do not care about the long term health of the plant, and will in fact countermand her and force through something even worse than their dumb, dumb ideas if she gainsays them too much on their damn profit margins. So, really, part of her job is convincing them to please knock their shit off and stop causing trauma to her patient. She... is less good at this part of the job. She's not terrible at it, exactly, and the hypercompetent ice queen persona who has singlehandedly tripled (at least) the time their plant will stay blue state is helping, but. ... There's only so much she can do.
Her life becomes one of a doctor or nurse who tends to the injuries continually inflicted upon her patient. Soften the blow, no don't aim there just yet, it's still healing, wait a couple of days and then you can without disturbing her too much. Her percentages are amazing, and she's probably doing a better job at this than literally anyone else in her field could manage, from a mix of specializing in this kind of healing and sheer personal investment. It's not enough. She can see the trend in this data, and the trend is that this poor plant is dying and will continue to die despite all of Yvette's cleverness and best efforts. All of the graphs and yelling at the people who pay her will not change any of that, at all. Only make their profit margins prettier.
She hates it all and she kind of wants to burn it all to the ground.