MIAMI - (CBS4) - To passersby, they were simply another couple walking the street.

But to a jilted, jealous ex-girlfriend, they were her target.

Miami police said 19-year-old Leslie Shantelle Sanabria was jealous to see her ex-boyfriend with a new woman and early Tuesday police say she tried to split them up using deadly force.

On Wednesday, Sanabria faced a bond court judge who ordered her held on a $25,000 bond. The judge also scolded her and said, "You're in deep trouble, ma'am, you understand?"

Sanabria simply nodded her head.

At about 2 a.m. Tuesday, police were called to West Flagler Street and 30th Avenue about a possible hit-and-run.

Police say Sanabria made a U-turn at that intersection to run over her former boyfriend Lazaro Crespo, 34, and his current girlfriend Olga Barrero, 19. The impact caused Crespo severe head trauma and a broken leg, while Barrero suffered minor cuts and bruises, police said.

Early reports suggested a 1993 Toyota Camry had struck two pedestrians and fled. But an investigation revealed that the two pedestrians were a couple and that the woman behind the wheel was the man's ex-girlfriend.

Police said she stole the car from an acquaintance.

Sanabria is now in jail and is charged with attempted murder, aggravated assault with a motor vehicle and grand theft auto.