One teenage girl and two teenage boys were involved in the attack, leaving the female victim with bruising on her face and chest.
The suspects are believed to be in their mid to late teens.
It happened around 3.30pm on Thursday, 22 August on the South Beck Footpath, off Byland Avenue.
North Yorkshire Police are appealing for information about any witnesses who may have seen the incident or people acting suspiciously in this area during this time.
Please email benjamin.portwine@northyorkshire.police.uk if you have any information that could help our investigation.
Alternatively, you can call North Yorkshire Police on 101, select option 2 and ask for Benjamin Portwine, or contact Crimestoppers anonymously on 0800 555 111 or via their website.
Please quote reference NYP-22082024-0458 when passing on information.
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