New York ? Police investigating a head-on highway crash that killed a suburban mother and seven other people said Friday she was fine at a fast-food restaurant an hour after starting her drive, narrowing the timeline for when she may have begun a drinking binge.

State police are piecing together Diane Schuler’s journey from an upstate campground, where she left in a minivan carrying five children, to a fiery collision with an SUV about four hours later after driving the wrong way for nearly two miles.

Schuler was sober when she left the camp at about 9:30 a.m. on July 26, but she had had more than 10 vodkas and was high on marijuana by the time she crashed on the Taconic State Parkway, just north of New York City, at 1:30 p.m., autopsy results found.

Schuler, 36, was killed along with her 2-year-old daughter, three nieces aged 5, 7 and 8, and three men in the SUV. Her 5-year-old son survived.