19-year-old Charlotte Clarke admitted assaulting Jasmine Watkins after leaving a nightclub in Worcester.
Prosecutor Liam Finch said: “On the evening of the incident, she was out with a group of friends and the defendant and her group of friends were at the same nightclub.”
“The injured party says it was clear there was bad feeling towards her and there was friction during the course of the evening.”
The assault took place after they left the Velvet Lounge Nightclub in Angel Place, Worcester, on Wednesday, August 24.
Charlotte Clarke suffered from paranoia and mood swings, which were detailed in a doctor’s letter presented in court.
Ruth Edwards, defending said: “When they met at the Velvet Lounge, Miss Watkins had returned from a holiday to Greece.”
“When she came back she started her relationship again with the girl and while they were in the club was certainly making it clear that she had just been using Miss Clarke while she was on holiday.”
“Miss Clarke felt put upon and used and stressed that everyone knew this was going on and laughing behind her back. They had all been drinking, the snide remarks continued and that resulted in the incident blowing up as you have seen.”
Miss Clarke was given a community order with six months’ supervision and must complete 100 hours unpaid work and pay £100 compensation.