Amber is basically accusing Johnny of attempted murder and rape. These are extremely serious allegations. If it had happened in the UK and she had presented at hospital with injuries after being dragged over broken glass and penetrated with a bottle the police would prosecute irrespective of the wishes of either party.
Is there any evidence to back up this claim? Did she go to hospital with dreadful injuries? Obviously the law is different in the US but if that had happened then surely Johnny would have been carted off to prison at the time.