The 16-year-old girl from St Saviour pushed the elderly man and kicked another man in the groin after an altercation on 28 May at Snow Hill, the Youth Court heard yesterday.
On another occasion she threatened a man with a knife while demanding cigarettes at Springfield Stadium on 28 June.
The teenager, who cannot be named for legal reasons, admitted all three assaults as well as breaching a previous binding-over order for malicious damage and causing a breach of the peace.
