Two women, aged 18 and 47, sustained life-changing injuries during an incident in The Nursery at around 3pm on July 6 last year.
Two 16-year-old girls were arrested on the same day on suspicion of attempted murder.
One girl was later charged with grievous bodily harm without intent against both women to which she pleaded guilty.
She was found not guilty of a more serious charge of grievous bodily harm with intent against the two victims.
The girl, now aged 17, appeared at Bromley Magistrates’ Court for sentencing on Wednesday, January 7.
She was sentenced to a one-year detention and training order.
A detention and training order means she will spend half her sentence in a young offender institution and the other half in the community.
