The Bronx girl killed by a tractor-trailer after leaving her job at Dylan’s Candy Bar on the Upper East Side was a brilliant student who dreamed of becoming a lawyer, her family said yesterday.

“I lost my baby!” cried Joy Clarke, the mother of Renee Thompson, 16, who hoped to attend Howard University in Washington after graduating from Coalition School for Social Change in Harlem next year.

Renee, of Undercliff Avenue in Morris Heights, was killed Wednesday at 10:15 p.m. when a tractor-trailer heading west on East 60th Street made a right turn onto Third Avenue, striking her as she was crossing Third.

Dylan’s was closed yesterday as shaken staffers coped with the tragic news.

The 35-year-old trucker had a green light and remained at the scene, cops said. He was not charged.