A 63-year-old Lake County woman died Thursday from injuries suffered in a head-on collision on Highway 29 near Clear Lake Riviera after an oncoming driver, later arrested for driving with drugs in her system, veered into the opposing lane, the CHP said.

Hidden Valley Lake resident Lee Ann White, 63, died at Sutter Lakeside Hospital in Lakeport after a planned air transport to a regional trauma center was aborted, CHP and Kelseyville fire personnel said.

Two children in the other vehicle, aged 7 and 10, also were seriously injured in the 12:15 p.m. crash caused, at least in part, by their grandmother's drug use, authorities said.

Their grandma, Janet Lee Mix, 60, of Clearlake, suffered moderate injuries and was released to Sutter Lakeside for treatment after her arrest for suspicion of driving under the influence of drugs, the CHP said.

The collision occurred on Highway 29 north of Highway 281/Soda Bay Road between Lower Lake and Kelseyville, the CHP said.

Authorities said Mix was driving a 1999 Toyota Sienna southbound when she drifted onto the dirt shoulder of Highway 29, overcorrected and careened across her own lane into the northbound lane, hitting a 1995 Mitsubishi Expo head-on.

The 7-year-old boy was airlifted to UC Davis Medical Center in Sacramento. The 10-year-old girl was taken to Sutter Lakeside Hospital in Lakeport, the CHP said.