Joanna was arrested because Olmos Park had issued an arrest warrant on her on Mar 23 for "interfering with the duties of a public servant" during the incident on Feb 20, when Jack Miller was arrested. During that incident she was 30 feet away from Jack standing on a sidewalk filming. An officer with an AR decided that she was a bigger danger than Jack and veered toward here yelling for her to stop filming. Her ran up to her and hit her knocking the camera out of her hand and knocking her to the ground.
The arrest warrant was retaliatory because of the negative publicity being generated due Jack's arrest and her being assaulted by the cop. Olmos Park tried to get Live Oak PD to execute the warrant and they refused when they found out what was going on and that the warrant was BS.
Here is a video showing her being assaulted. Typical cop assaults someone then charges them with interference or disorderly conduct, etc, etc, etc, later when it goes public and they start taking heat.
Everyone knew she was going to get arrested. Just more rope for Olmos Park to hang themselves with. I think they all knew Olmos Park was going to get out of hand because they can't help themselves. That's why they had several people recording video.
https://youtu.be/kyIxNncS8Ec