Carly Rousso, 19, of Highland Park was found guilty of aggravated DUI in the death of a 5-year-old girl.
Prosecutors said Rousso was high from huffing a computer cleaning solvent when she hit a Highwood woman and her three children on Labor Day, 2012, in downtown Highland Park.
Jaclyn Santos-Sacramento, 5, was killed.
Just before the trial began, Rousso pleaded guilty to reckless homicide.
She will be sentenced at a later date.