The youngster - who was cautioned last year for another act of criminal damage - had been asked by police if she knew the seriousness of what she had been a part of.
She replied 'I wasn't bothered.'
She had smashed shop windows in the city, after joining in with a rampaging gang of 30.
She told the police: "I knew it was going to be bad, I just went along with everyone else. I knew I could get into serious trouble but none of us thought we were going to get caught."
Her dad was in court to speak for her and told the court "She knows what she's done and wants to say sorry. She's going through a bad time and just ran away from her foster place."
He asked her to apologise to the judge but she said nothing, smirked and looked away.
The child, who is currently in care, was given a referral order after admitting criminal damage and attempted criminal damage.
The Sun reports that as she left court she yelled, "You fat c***" at a photographer whilst her dad grabbed his crotch and made an obscene gesture.