A Somalian woman who entered the United States about 18 months ago as a refugee was charged yesterday in Quincy District Court with trying to stab her boyfriend to death as he drove a tractor-trailer along Route 128 south in Randolph Thursday night. The victim, Mustafa Warsame, 38, brought the truck to a stop in the breakdown lane, hitting the guardrail. He staggered out and told a witness, "My girlfriend stabbed me," before collapsing on the pavement. A prosecutor said the defendant, Deka Artan, 21, ran from the scene with her 2-year-old daughter, but stopped a short distance later.