Three teenagers tried desperately to save the young mum, but she succumbed to her injuries after her car crashed into a tree.
Kimi Waaka, 27, died after she lost control of her Suzuki hatchback on Nicholson Road, Langford about 11pm.
WA Police said the car struck a tree in the median strip, throwing the woman from the car.
She suffered “life-threatening injuries” and, despite the efforts of onlookers, died at the scene.
Three teenage girls told 9 News they tried desperately to save the woman, attempting CPR until emergency services arrived.
“I just was like screaming and crying and just like…