If the attendee's description is true and the video is not missing context, then that doesn't appear to be what happened. Interpreting her description and the video, during the public comment period for an unrelated topic, she went through the usual process for giving a public comment, started her completely off-topic written statement, then was arrested during it a few seconds after two attempts by the council to interrupt her, during which she was flipping off the council.
If she was within her allotted time for a comment that was completely off-topic but otherwise complied with the public comment process, and her flipping off the council was, as she claims, only after it was clear that she was going to be interrupted by the police, then that does seem different than actually interrupting the discussion or refusing to leave.
If she was within her allotted time for a comment that was completely off-topic but otherwise complied with the public comment process, and her flipping off the council was, as she claims, only after it was clear that she was going to be interrupted by the police, then that does seem different than actually interrupting the discussion or refusing to leave.