'A further period of detention is not necessary for the purpose of retribution and deterrent,' he said.

Judge Ng also expressed the hope Tan would broaden her horizons and establish constructive interests through the unpaid service.

Tan was found guilty last month of assaulting volunteer bouncer Thomas Hall, whom she hit in the face with a mobile phone after he helped throw her and her then boyfriend, Nick Dover, out of the Sevens party at the Indian Recreation Club in So Kon Po on March 20.

She was also found guilty of criminal intimidation for threats she made against Mr Hall when she and Mr Dover were ejected from the party organised by Valley RFC.

But she was acquitted of ordering the attack on Benjamin Ford outside the club.

Mr Ford suffered multiple injuries when he was dragged from a taxi outside the venue and attacked by four masked men wielding machetes shortly after midnight on March 21.

Tan had pleaded not guilty to all charges.

Defence counsel Charlotte Draycott had told the court in mitigation that Mr Hall, who was a 'tall' and 'strong' man, had testified in the trial he did not feel much of a threat or attack at the time. She added Mr Hall did not even report the incident to police.

'The matter would have ended there had Ford not been attacked,' Ms Draycott said.

However, Judge Ng rejected mitigation that Tan had become intoxicated that evening under the influence of her then boyfriend.

'You are a 42-year-old woman with a grown-up daughter ... You should be responsible for your behaviour,' he said.

Mr Ford, 32, remembered little of the attack. The British financial consultant and member of the RFC underwent 15 hours of surgery to treat chop wounds to both legs and reattach two fingers of his right hand severed in the attack.