Giving her a two-year youth rehabilitation order for grievous bodily harm, the judge said: 'It would be a disgrace to send a survivor like you to prison'.
He added: "It is self evident that this offence was caused by, and solely relates to, the impact of the offending upon you when you were eight. I hope to be able to help you."
The judge was investigated by the Judicial Conduct Investigations Office which issued him "formal advice", the lowest form of sanction.
In a statement it said: "The lord chancellor and the lord chief justice considered this failed to demonstrate impartiality, and that his comment amounted to misconduct."