Negar Karimian sustained injuries when law enforcement officers mistakenly fired at their moving car on Saturday and later died in hospital with severe internal bleeding.
US-based Human Rights Activists News Agency (HRANA) news agency reported that officers suspected the family's vehicle was carrying narcotics and opened fire.
According to Hengaw Human Rights Organization, a Kurdish rights group, Karimian was so badly wounded that her organs were even too damaged to donate.
The incident is the latest in a series of deaths by Iran's security forces. In a similar incident on June 9, a nine-year-old child lost his life after law enforcement officers fired at a van without warning. In January, Iranian security forces shot at a car and killed 20-year-old student Anahita Amirpour, also in Lorestan province.
According to HRANA, a total of 402 citizens were victims of military forces' shootings in 2023, with 120 deaths reported.