AN argument at Stroud College Ball left a student's face permanently scarred after she was injured by a glass.
Katherine Martin admitted causing the injuries to Leanne Hudson at the end of term party.
Gloucester Crown Court heard the 21-year-old, of Market Street in Nailsworth, lashed out with the glass in her hand.
Prosecutor Mary Cowe told the court there were several witnesses to the incident in the toilet, but each had a different account of what had happened on June 29.
She said some accounts said the girls had to be pushed apart following a confrontation, while others said it came out of the blue.
Ms Cowe told the court: "The complainant said she had considered not going to the ball because of the defendant's actions in the past. At around 10.15pm they were both in the toilets, but there is no suggestion the defendant went looking for her.
"The complainant describes her lunging towards her face and then she felt blood running down her face. When the defendant was interviewed she said it was an accident. She said she felt panicked and accepts causing the injury, but doesn't know how it has come about."
Martin, who fled the toilets after Miss Hudson was injured, pleaded guilty to unlawful wounding.
Miss Hudson was left with a one-and-a-half inch cut on her left cheek that needed six stitches and a similar sized cut to her chin, which was not as deep. The scar is still visible and the prosecutor said Miss Hudson still felt intimidated.
Defending, Giles Nelson said: "She has very loving parents and educationally this lady has struggled. She has been very anxious about these proceedings and it is very difficult for her to deal with."
Judge Jamie Tabor told Martin, who works in a charity shop, he had previously seen catastrophic consequences of glassings.
He said: "I accept you lashed out while carrying a glass in your hand. This was a reckless and mindless action."
Martin was given a nine month sentence suspended for two years with a three month curfew from 8pm to 6am. She was ordered to pay £1,000 compensation in two months and £500 costs.
