I suppose if she isn't actually harming anyone
We had a girl ouside the house next door last year and she was being abusive to the French tenant who had befriended her at the library (and hasd stolen and I pod or something) I have never heard language or attitude like ot from a 12 year old
I called the police becuase she was obvioulsy a minor and she wasn't a bit bothered and continued her attitude when they arrived
they did arrest her and eventually it all went to court but I would have been terrified at that age..................but on the other hand i would have feared my parents more