Here’s exactly what she said:
“Long ago, there was a vast, multiversal war. Countless unique timelines battled each other for supremacy, nearly resulting in the total destruction of, well, everything. But then the all-knowing Time-Keepers emerged, bringing peace by reorganizing the multiverse into a single timeline, the Sacred Timeline. Now, the Time-Keepers protect and preserve the proper flow of time for everyone and everything. But sometimes, people like you veer off the path the Time-Keepers created. We call those Variants. Maybe you started an uprising or were just late for work. Whatever it was, stepping off your path created a nexus event, which, left unchecked, could branch off into madness, leading to another multiversal war. But, don’t worry, to make sure that doesn’t happen, the Time-Keepers created the TVA and all its incredible workers. The TVA has stepped in to fix your mistake and set time back on its predetermined path. Now that your actions have left you without a place on the timeline, you must stand trial for your offenses.”
*It feels important to note that this introduction contains the words “multiverse” and “madness,” and that the title of an upcoming MCU film is literally Doctor Strange in the Multiverse of Madness. Do with this information what you will.