A group of teenage girls were involved in a disturbance inside and outside Hollywood Bowl at Lakeside shopping centre, which saw the victim punched and kicked.
According to Essex Police, staff at the venue intervened, offered support to the victim and a report was made to the force following the incident at around 4pm on Friday.
The teenage girl suffered an injury, which is not described life-threatening or life-changing, and an investigation was launched which has resulted in four arrests.
Chief Inspector Tony Atkin, Thurrock district commander, said: “My team have progressed an investigation into this incident and are pursuing a number of lines of enquiry.
“The victim has been identified and is being supported by police. Incidents of this nature will simply not be tolerated and we will always look to pursue those involved.
“We are in frequent contact with partners, including businesses like Hollywood Bowl, and work closely with Lakeside security to deal with issues of anti-social behaviour where they arise.
“We are aware of and have analysed footage circulating on social media relating to this matter and I would urge against sharing this any further to preserve the integrity of our investigation.
“Instead, please share any relevant footage or information directly with us. This could prove vital in helping us move forward with our enquiries.
“I would ask anyone who recognises those involved to come forward to us, as well as anyone that witnessed the incident taking place.”
Four girls, aged 17, 15 and two aged 14, have been questioned on suspicion of assault occasioning actual bodily harm.
One remains in custody and three have since been released on bail with stringent conditions attached while enquiries continue.
A spokesman for Hollywood Bowl added: “We take the safety of all our guests and our team extremely seriously. Incidents of this nature are totally unacceptable.
“Team members who were on duty intervened and provided the victim with immediate support in our centre as well as offering to report the incident to the police.
“We are continuing to support the police with their ongoing investigations and would like to extend our well wishes to the victim and the family at this time.”
Anyone with any information should contact police on 101, citing reference 42/1343/25 when getting in touch.