The crash happened just before 7 a.m. Saturday on westbound Highway 198 near South Jameson Avenue.
Officers say a woman in her late 20s drifted to the right shoulder, then drifted back toward the left, making her spin out multiple times.
Her car would then go down a small dip and roll over.
Investigators say the woman was not wearing a seatbelt and was ejected from her car.
The woman has not been identified.