A girl gang made their victim pick who to fight after they hunted her down over a Facebook photo.
Sophie Burrows, 19, drove for miles with two other friends to ambush their victim, 14, in a playground.
Terrified, the girl picked Burrows.
‘You made the worst mistake of your life,’ she told her, sliding a metal crowbar from her sleeve.
The victim tried to throw a punch in self defence and the three then set upon her, Burrows striking her with the 30cm wheel brace.
The three targeted the girl after they saw a picture on Facebook showing her hugging a boy.
Judge Neil Stewart blasted ‘ridiculous’ insults they traded before the bullies tracked her down in Guildford, Surrey and attacked on January 9 last year.
‘They went into [Stoughton recreation ground] and stormed straight up to the girl,’ the prosecutor told Judge Stewart.
‘Sophie then said to her ‘you have to pick one of us to have a fight’.
‘The girl was frightened… but she didn’t want them to know that because she thought that would make it worse.’
The terrified victim was backing away and threw a ‘pre-emptive punch’ at Burrows.
Ms Duncan carried on: ‘Thereafter, she was set upon by all three girls. She ended up very quickly on the floor and there were blows being rained down on her – kicks and punches.
‘To start with she tried to fight back but then she just had to cower on the floor and hope that they stopped.’
The victim was hit with such force that injuries to her head matched the shape of the wheel brace. She had to have her head wounds glued together, now has a lump on her nose and suffered from depression after the attack.
The three admitted wounding with intent after they sent texts boasting about the attack.
The messages 5ft 4ins Burrows sent to her ex-boyfriend Taz were read out in court.
They said: ‘She chose to fight me out of the three of us, she is bleeding hard, her fault.
‘There is a video of me hitting her with a crowbar, that is the problem and she is known as a grass.
‘I would not normally have the guts to hit someone with a weapon but I was really drunk.’
She also sent a message to the younger attacker, who has not been named, reading: ‘We need to discuss what we are going to do, what our story is going to be (to police).’
The court heard the 17-year-old replied, ‘Yes we do, ha ha’, and that her mother had been telling her to deny the attack and delete the messages on her mobile phone.
Burrows, of Long Gore, wept in the dock at Guildford Crown Court as she was sentenced to 14 months in a youth offenders’ institution.
Co-attacker Lauren Coveney, 19, Petersfield Road, was given a suspended prison sentence and a 17-year-old girl who cannot be named for legal reasons, was given a referral order.