A Perth woman who ploughed her car into a group of boys in an "act of vengeance" after a southern suburbs brawl in 2017, killing a teenage boy, has been found not guilty of his murder by a jury.

It took jurors just over two hours to find Aya Hishmeh, 23, not guilty of the murder of Jacob Cummins, 17, over the December 2017 incident, but she was found guilty of the lesser charge of manslaughter.

Aya Hishmeh. Credit:Nine News Perth

Hishmeh was also charged with the attempted murder of Robert Bell, Augustine Janga, Mark Kickett and Anwre Ige but the jury also found her not guilty of those charges - instead finding her guilty of causing bodily harm.

The incident came after a brawl escalated when Hishmeh intervened in a fight between Mr Cummins' group of friends and her family, and later was led to believe one of the boys had injured her younger sister.