When I called the police because two hooligans were jumping on the roof of my neighbour's car (he was away from home), trying the door handles and throwing beer bottles in the road - they couldn't even find one officer to attend.
I make no judgement on this particular incident - the video is, as said, only a snapshot of the incident, the police do face abuse and - did they know she was autistic?
However, after they were informed she was autistic, did they really need to take her into custody? Couldn't this have been dealt with in the home? There was a time when police officers had the intelligence and wit to warn young people, in the presence of their parents, and caution them.