One last try.
If she has breached her bail conditions I believe they are entitled to arrest her. Handcuffs are the usual means of reducing the risk of an arrested person being violent or absconding. I would expect her to be walked to a nearby vehicle to be transported away from the area or to a police station for processing. It appears that in the clip she has not been arrested but instead we see the strange, unnecessary, and troubling wrist grip. I say that people that present little risk should not have to suffer unwanted and prolonged physical contact from police officers or anyone else. The fact that this is a young woman resonates with other incidents in which innocent women have been harmed.
My opinion is based on the video clip we have both watched. Neither of us knows for sure what happened before or after the recording, which is why I very deliberately described it as troubling and weird but have not alleged misconduct.