She complains that the company didn't tell her she was a diversity hire? Doing this seems like a recipe for any diversity hire to always have imposter syndrome.
There's definitely sexism in the tech industry but I'd argue the best way forward is with tact. Coming out guns blaring with accusations and always assuming bad intentions will just alienate people from the cause.
She'd be better served trying to understand where people are coming from and working through specific, addressable issues.