Even a twisted mind can be sharp my friend... she wouldn't be able to run that business of hers and pretend her mariage wasn't over just yet if she was a total imbecicle... pretty sure that Caroline comes after her... cause the dad (Bob) isn't much of a businessman himself... he manages, but he probably would fail on his own.
Linda is an empty shell in Milfy. She has almost no details to her character. A few lines of text here and there about herself is it. Remember that is what many people say is Milfy's strong point. No wasting time with exposition or backstory. Straight to the sex with the dialog.
90% of business fail, how do you know her company isn't in chapter 11? There are no details and people have turned Linda into a female Jobs. For all, anyone knows this is a business Bob set her up with to keep her bored angry ass happy. The scenario I just gave is as plausible as any presented because the "story" in Milfy City is nonexistent. Linda's parents might have been rich and it is just old money and daddy's business. In your post, you say Bob is a bad businessman because he works hard? He should have made millions except for his shitty son. If you do not fuck him over the story does not give Bob the millions he was supposed to make.
The extent of knowledge we have about Linda's business is a dirty empty office. Which we have no idea what it does(I can't remember if there was mentioned or not TBH) I was wrong about her owning it though.
I find the game amusing and sometimes a bit cringe. By that I mean the story being bad, not the incest. There are 2 characters close to being decent in this story, Sara and Bob. That is it.
But as far as Linda is concerned. The text shows she is pretty much scum. Any positive attributes, such as success, are pure conjecture and projection. I play no Incest where Linda is just deeply flawed individual with unknown issues. If you play the incest route she is a complete and utter train wreck. In that universe, she raised an entire family of kids into fucking each other. She is grooming her only son to use her as a meat sleeve. How soon before she is eating Caroline's and Sara's pussies. LOL yeah, the character Linda is total garbage no matter how you slice it.