At about 10.30pm on Friday, May 10, the victim had just parked her car in Cedar Road when she became involved in a "verbal altercation with a man who called her derogatory names".
When she returned to her car at around 3pm the next day, she found it had been scratched with a key.
Anyone who saw what happened, or saw any suspicious activity around a vehicle in Cedar Road at the time of the incident, should call Northamptonshire Police on 101.
Information can also be shared anonymously via Crimestoppers on 0800 555111.