A city woman who was allegedly under the influence of heroin when her car collided head-on with another vehicle is facing multiple charges Monday under Leandra's Law.Wendy L. Cook, 47, was charged with felony aggravated DWI and misdemeanors operating a motor vehicle while impaired by drugs, endangering the welfare of a child, criminal using drug paraphernalia and criminal possession of a hypodermic instrument, Saratoga Springs city police said.