MONTGOMERY, Ala.—The driver of a girl’s home van in which eight children died in a fiery interstate crash in Alabama has filed suit against trucking companies based in California and Georgia and a driver, her lawyers said Monday. The federal lawsuit, which seeks an unspecified amount of money, recounts a desperate attempt by the woman, Tallapoosa County Girls Ranch director Candice Gulley, to free victims from the wreckage. Two of her own children and two nephews were among those killed. Pulled from the crumpled van by others, Gulley ran around trying to help children escape the burning vehicle, the suit said, but no one could be saved because of the flames and damage. “All the children were killed by the fire,” said the suit, filed Friday. Eight children ranging in age from 3 to 17 died in the van, and the suit said Gulley suffered burns, bruises, and severe emotional …