TIFU by reading this thread in detail rather than skipping to the TL;DR. I could have lived without the knowledge of someone being stabbed that gruesomely...

Well, hope you learned that people aren't what they seem to be so you can be more cautious in your approach going forward at least.

Either way, it's not really advised behaviour to be that frank about your boss to her boss, it's a bad look in any case. You basically snitched on her, regardless of what your intentions are, and that's just not smart. I'm sure we've all heard of how the saying about snitches go.

Like I said, in the future, if this happens again and you genuinely want to help your boss, don't bring her up in the conversation. Express to him that you're doing your best but the department is lacking resources, and see if there might be alternative solutions involved without bringing others in the conversation. It's corporate 101 really.

Okay, "someone" had to deal with them.

If these issues were to remain, and she had gotten better, would she have dealt with them given how she was the one that fixed things initially?

Are there HR resources at your company? I'm not saying to GO to HR, but maybe look at up and see if they have support for Long Covid and other health issues, as a lot of company actually do have those resources. Suggest them to her politely?

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And sure, even if you WERE to have good intentions by speaking to her boss, does venting EVERYTHING sound like a good idea? Instead of venting about your boss, ask him explicitly to see if there might be more support available in the pipeline without looping your boss in the conversation. There's really no reason to speak about your boss to her boss unless you were trying to get her into trouble. There are multiple ways of presenting the message and you chose the worst one.

You keep telling yourself that but you're working in a corporate world. This isn't a charity.

You told your boss' boss that your boss isn't performing. How in any way do you expect that to help her? Furthermore, you were explicitly asked by him (the boss' boss) about any issues you may have with her. Are you so naive to think that it is a "positive" sign?

Let's face it, you got frustrated and threw her under the bus, hoping that'd make your life better, without a second thought as to how it may potentially influence hers until it directly impacted yours. If you can't even own up to your selfishness then you'll just do it again in the future. You're still trying to excuse yourself in this case so I don't see any real self reflection going on.

Well for starters, from what it sounds like, she definitely has long covid. From someone who struggled with long covid for over a year, I can tell you it feels like hell. Your brain is foggy to the point where you have trouble remembering an idea long enough to finish an entire sentence. When I had to read a paragraph, I could barely remember the beginning of the paragraph when I got to the middle of it. I struggled with doing simple math (and I was fine with advanced algebra my entire life) because I simply cannot even remember what I'm doing half way through. At some point I feel like I'm losing my mind.

What the above means is that doing well in a job search is basically impossible. I highly doubt you would be able to present your best foot forward in an interview when you struggle with holding onto ideas. She's probably already stressed enough trying to hang onto her own mind and now you've added more stress to that by putting her through a job search, in this economy.

You may have feel unsupported at your work, and that's frustrating, I get that. But you said yourself this is someone who came in, made improvements, promoted you, and helped improved overall performance. Clearly, she wasn't feeling like herself. Instead of just venting your frustration to her boss, you could have given her more benefit of the doubt and just a few more times to reach out.

But you didn't, you got her fired by going over her head to her boss. You're now "repenting", when your OWN job was at risk. This entire thread is about yourself and you're just looking for sympathy for someone to tell you that it's not your fault, otherwise, why would you not have posted about this when you got her fired, before you realized your own job was at risk?

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I think you should just own up to the fact that you screwed up and be more considerate next time.