"child, 13" - a 13yo is a teenager, not a child.
That article was a pain in the ass to read, horribly structured.
What she did: "The court heard the girl was taken to the protest outside the Potters International Hotel, which houses asylum seekers, by a parent of a friend. Police body-worn video showed the teenager briefly bang and kick at a door of the hotel while voices could be heard telling her to stop."
Her sentence, a "12-month referral order": "A referral order means you are required to attend a youth offender panel. The panel, you, your parents/carers and the victim (where appropriate) agree a contract aimed at repairing the harm that has been caused and addressing the causes of the offending behaviours." (https://unlock.org.uk/advice/referral-order-18/)
The conviction seems to be on permanent record, though, which does seem a bit much for this considering her age.
What difference does that make?