The 16-year-old victim was crossing High Street shortly after 3.15pm on January 27, at the junction of Hayway, when she was in a collision with a silver vehicle.
She rolled on to the bonnet of the vehicle and then off into the carriageway and suffered a fractured collarbone as a result.
The vehicle, which was travelling from the direction of Wellingborough, continued without stopping.
Police would like to speak to anyone who may have witnessed the incident.
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Contact police on 101 or Crimestoppers anonymously on 0800 555111.