A desperate woman facing eviction from her south Santa Rosa apartment poured gasoline over her body Sunday evening, before setting a fire that nearly destroyed the four-unit property and cost herself and three families their homes, a Central Fire official said Monday. “She was very desperate and she basically doused herself and her bedroom and her mattress in gasoline. She laid down, lighter in hand, and flicked the lighter,” said Cyndi Foreman, a fire prevention specialist with the Central Fire Authority of Sonoma County who led the investigation.