Both were taken to Whidbey General Hospital in Coupeville.
The driver, 48, is under investigation for vehicular assault, the Washington State Patrol reported. Troopers believe alcohol was a factor in the crash, according to an accident memo.
The Coupeville woman was driving a 2007 GMC pickup truck southbound on Zylstra Road at Hastie Lake Road when it crossed the centerline and struck a tree, troopers reported.
Her passenger -- a 9-year-old child whose gender was not reported -- is from Lake Stevens.
The crash remains under investigation.
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