Citing fire investigators, ABC-affiliate KOMO 4 reports that mother-of-two Courtney Campbell had no chance to escape once flames engulfed the kiosk.
The business, known as "Sinners and Saints", is located inside a Shell gas station on on Everett Mall Way and Fourth Avenue West in Everett. Campbell was its owner.
Firefighters said a propane tank stored inside the stand contributed to the fire, the Seattle Times reported. The fire also spread to a nearby vehicle.
Campbell died on Monday at Harborview Medical Center, Q13 Fox News reported. Her death has been ruled as an accident by the King County medical examiner. She is survived by her two young daughters, aged 3 and 8.