I imagine it's very hard dealing with a teenager with autism, or who is neurodivergent, but the last thing that will help in any situation is to splash the whole thing on social media.
Maybe the girl was out on the town because the mother can't control her daughter, it does happen, but even so, the first avenue to go down when you think there's been a mis-handling of the situation by the police - is not social media.
And, frankly, although the police are being made aware of mental health problems in young people and training is given, it really is not their job to deal with this. It is the job of the overstretched and underfunded mental health services who need to be working with the parents - parents who will hopefully be advised that using social media to air grievances in the first instance is absolutely the wrong way to deal with an incident like this.