The woman, 38, was driven to Providence Regional Medical Center Everett with possible broken bones to an arm and leg, the Washington State Patrol reported.
Troopers believe the westbound car she was driving crossed the centerline and struck an eastbound pickup truck, which rolled over.
The woman's car rolled over twice and she was trapped inside, trooper Mark Francis said.
The collision occurred just before 4 p.m. Traffic was blocked for more than an hour.
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