California plates. I was pulled over and searched years ago in Kansas for the same reason.
In this case, the Flock data then showed a bunch of recent interstate travel, which cops consider to be probable cause. They know it’s not legally probable cause though, so they pointed to her “nervousness” (aka not consenting to search).
The real question is how many times the same cop pulled over people who he searched and found nothing. Certainly nonzero.