How Did This Happen?

I was talking with a friend today who I used to work with in Michigan many years ago and we discussed our former supervisor. This woman was a nice lady, but she was clearly over her head in terms of the job and her ability to do the job. She wasn't college educated despite having several college graduates working under her, her writing and speaking skills were challenged, and she just wasn't very bright. Yet, despite all of this, she was a manager. Eventually, she was let go from the company under mysterious circumstances. Maybe someone finally realized she couldn't hack it. In any case, I've often wondered why she and so many others even managed to get into management positions they clearly were not/are not qualified for. Yes, some people are smooth talkers who can talk themselves into jobs they aren't qualified for. They're able to fake it till they make it. But my former supervisor wasn't a smooth-talker or some hot young thing who could bullshit or flirt her way into a management position. So how did this happen? How was she able to get a management job she so clearly wasn't qualified for? I think she just had a friend in higher management who helped her out. But in helping her, her friend did my supervisor, our department, and the company as a whole a huge disservice. Because this woman lacked even the basic skills that should have been required for a manager, she constantly underperformed in the role and frequently embarrassed herself with her poor writing and awful communication skills. Her staff often had to correct her spelling and that's just embarrassing. I wonder what happened to her. Did she go back to school, get a degree, and find a management position she could handle? I certainly hope so. She wasn't a terrible person, just an unqualified manager.