It's plausible, I admit. But much more likely, to me, is just artistic exploitation 101 (if it turns out he did borrow a lot from her story). She has a specific problem with Eggers getting away with it. She would too if her article was published in the NY Times. She seems to be playing identity politics in a situation that doesn't warrant it: Perhaps she was unlucky in her career? Perhaps Eggers has better agents? Perhaps Eggers is a better writer, or has more experience? Perhaps Eggers' brother works at the NY Times? I would posit that, in this case, it's unlikely that Eggers had his piece published and got away with ripping off her article because he is a white male.
I recognize that sexism and racism definitely exist in Silicon Valley, but the problem she's trying to point out is broader — it's the overzealous linguistic bullshit promoted throughout culture (and that includes other industries, mind you). It's the 'engineering perspective' applied to all situations without discretion. Solve every problem in all domains like its a physics problem. Silicon Valley has a penchant for hyperbole and thus is always "killing," "disrupting," and "breaking" things.
In a linked essay, she declares it to be myopic to promote Facebook's mantra of "move fast and break things" because it leads to unjustly enforced criminal activities like trespassing — and might be "rapey" ("rapey" is her language). Facebook's mantra started in the context of writing internet software. Minorities and women have little disadvantage in that specific context. The problem rose when the life advice language got so widespread (applied to every possible situation in Medium blog posts) as to become meaningless. Now she's pissed off because minorities and women can't get away with breaking things and asking for forgiveness in all areas of life, but young, white men can...and that's exemplified through the popular philosophy of Silicon Valley. First, that again is so broad as to be meaningless (e.g. I can think of plenty of examples where being a young woman let's you get away with things others' can't). Second, "act first and then ask for forgiveness" and related Ferrissisms are all tropes carried over from other industries and books (ever heard of 'sales'?). Third, it targets Silicon Valley as the epicenter of discrimination, which kind of makes it look like she's never worked or lived in any other industry or area of the world.