Ask your coworkers who interact with your supervisor, to email a summary of what has happened to them too. There is power in numbers. If you have at least a minimum of two other coworkers who've experienced personal politics from your supervisor (based on the examples you've provided in your thread here), that will help your case with credibility. Only ask those coworkers who can be discreet, whom you can trust. Otherwise, they could blab to your supervisor, "Hey...Seesaw wants us to badmouth you to make her case stronger."

Otherwise? It's just personal politics at play; your word against hers. And if she has upper management on her side, as I said, there is power in numbers.