As burning ash and black smoke eclipsed six lanes of terrified motorists fleeing the worst fire in California history, Elizabeth Steffen was driving in the wrong direction. Steffen, the director of the SacValley Medshare health information exchange, rushed down Route 99 to Oroville Hospital last month on a single-minded mission: to turn an electronic switch enabling medical records to follow 200 patients evacuated in a mad scramble from a burning hospital and nursing home in Paradise, a town that would soon be annihilated by the Camp Fire.