Can anyone help me with a work problem?

People who are not management are seeing the problem. Upper management is not seeing it yet, and there aren’t any people in upper management who I think will believe me and take any kind of action.

Our org chart is:
Head Cheese (good buddies with my boss and the person who handed her the job)
Deputy Head Cheese (who I don’t trust and it might be dangerous for me to talk to)
Chaos Demon Boss

HR is not listening, and upper management is not listening. I think HR knows that she’s a problem, but there’s not much they can do, and they have pressure from upper management. We do have an ombuds, but I don’t trust him either. I did talk to our former ombuds, but that was before a lot of these developments happened. She’s still with us in a different job, but I’m going to talk to her because she’s a wise and insightful person.