Sentencing Judge Alan Conrad QC said: 'This was serious group violence at night, in public, on a crowded street.
'The incident was taken to an altogether and more serious level by Megan Madden using that knife to stab the victim repeatedly to the head, face and neck causing wounds of which she is actively conscious of and causing her to be fearful of going out in public.
'I accept that there was some provocation but you all continued to be involved none the less.'
Turning to Megan, the judge said it was disturbing she was carrying a blade and that she drew that in a violent situation.
'The carrying of a knives are matters of great concern,' he said. 'You face for this a significant custodial sentence.
'A stab wound to the neck can quite easily result in a fatal injury and you could have been spending at least 25 years in prison.'