This guy nailed it. It explains why she is refusing to budge at all costs to the nation, and why she doesn't have a helpful attitude toward the commission.
A normal person would say, "Hey I have some knowledge that might help the public understand what was going on and why certain decisions were made. It's more important that I be on the record with my knowledge. Any Joe Blow can ask the questions. Plus, now my being up here is causing national strife and loss of confidence in our work."