To document what? That they wanted to meet with her? The OP would have been free to take notes at the meeting and and any sort of action taken against her after the meeting would have been provided in writing. She was demanding the minutes of the meeting in advance. The professor was under no obligation to provide her a complete list of topics to be discussed prior.
And even if it was a reasonable request and they refused it was still very foolish of her not to attend if she values her education.
This OP knows the ropes - she knows how schools work, and she asked to be notified in writing of the reason she was being called to a meeting, so she could request off work. She had already been somewhat harassed by the instructor, so she was smart to ask for the meeting to be requested in writing. Creating a paper trail is the smartest thing you can do in education, and something that could turn out to be a legal issue.
The professor WOULD be required to submit a ticket or request to have a meeting through Judicial Affairs. There would HAVE to be documentation, not just a "Hey, let's talk in Judicial Affairs." That's not how the chain of command works.
She obviously values education, so has two Masters and a Doctorate.
The school messed up here. She has a right to file a grievance.